- Aachen (Aix-la-chapelle), Germany
- Aba, Nigeria
- Abaetetuba, Brazil
- Abakaliki, Nigeria
- Abancay, Peru
- Abengourou, Côte d'Ivoire
- Abeokuta, Nigeria
- Aberdeen, Scotland, United Kingdom
- Abidjan, Côte d'Ivoire
- Abomey, Benin
- Abuja, Nigeria
- Acapulco, Mexico
- Acarigua-Araure, Venezuela
- Accra, Ghana
- Acerenza, Italy
- Acerra, Italy
- Achonry, Ireland
- Acireale, Italy
- Acqui, Italy
- Addis Abeba, Ethiopian Catholic Archeparchy, Ethiopia
- Adelaide, Australia
- Adigrat, Ethiopia
- Adilabad, India
- Adria-Rovigo, Italy
- Afogados da Ingazeira, Brazil
- Agaña, Guam
- Agartala, India
- Agats, Indonesia
- Agboville, Côte d'Ivoire
- Agen, France
- Agra, India
- Agrigento, Italy
- Aguarico, Apostolic Vicariate, Ecuador
- Aguascalientes, Mexico
- Ahiara, Nigeria
- Ahmedabad, India
- Ahvaz (Ahwaz), Chaldean Catholic, Iran
- Aiquile, Territorial Prelature, Bolivia
- Aire-et-Dax, France
- Aitape, Papua New Guinea
- Aix-Arles-Embrun, France
- Aix-la-chapelle: see Aachen
- Aizawl, India
- Ajaccio, France
- Ajmer, India
- Akka, Melkite Archeparchy, Israel
- Alagoinhas, Brazil
- Alajuela, Costa Rica
- Alaminos, Philippines
- Alba Pompeia, Italy
- Alba Iulia, Romania
- Albacete, Spain
- Albano, Italy
- Albany, United States
- Albenga-Imperia, Italy
- Albi, France
- Alcalá de Henares, Spain
- Alep (Melkite)*, Syria
- Aleppo (Syrian Catholic),*, Syria
- Aleppo (Maronite),*, Syria
- Aleppo (Armenian),*, Syria
- Aleppo, Chaldean Catholic*, Syria
- Alep(po), Apostolic Vicariate (Roman Catholic), Syria
- Alessandria, Italy
- Ales-Terralba, Italy
- Alexandria of Egypt(-Heliopolis-Port Said), Apostolic Vicariate, Egypt
- Alexandria (Iskanderiya), Armenian Catholic Eparchy, Egypt
- Alexandria-Cornwall, Canada
- Alexandria in Louisiana, United States
- Algiers, Algeria
- Alghero-Bosa, Italy
- Alife-Caiazzo, Italy
- Alindao, Central African Republic
- Aliwal, South Africa
- Allahabad, India
- Allentown, United States
- Alleppey, India
- Almenara, Brazil
- Almería, Spain
- Alotau-Sideia, Papua New Guinea
- Alquoch, Chaldean Catholic Eparchy, Iraq
- Altamura-Gravina-Acquaviva delle Fonti, Italy
- Alto Solimões, Brazil
- Alto Valle del Río Negro, Argentina
- Altoona-Johnstown, United States
- Amadiyah, Chaldean Catholic Eparchy, Iraq
- Amalfi-Cava de' Tirreni, Italy
- Amargosa, Brazil
- Amarillo, United States
- Ambanja, Madagascar
- Ambato, Ecuador
- Ambatondrazaka, Madagascar
- Ambikapur, India
- Amboina, Indonesia
- Ambositra, Madagascar
- Amiens, France
- Amos, Canada
- Amparo, Brazil
- Amravati, India
- Anagni-Alatri, Italy
- Anápolis, Brazil
- Anatolia, Apostolic Vicariate, (Asian) Turkey
- Añatuya, Argentina
- Anchorage, United States
- Ancona-Osimo, Italy
- Andong, South Korea
- Andria, Italy
- Aného, Togo
- Angers, France
- Angoulême, France
- Angra, Portugal
- Anking, China
- Ankwo, China
- Annecy, France
- Annunciation of Ibadan, Maronite Catholic Eparchy, Nigeria
- Anse-à-Veau and Miragoâne, Haiti
- Antananarivo, Madagascar
- Antélias, Lebanon
- Antequera, Mexico
- Antigonish, Canada
- Antipolo, Philippines
- Antofagasta, Chile
- Antsirabe, Madagascar
- Antsiranana, Madagascar
- Antwerp, Belgium
- Anuradhapura, Sri Lanka
- Aosta, Italy
- Aparecida, Brazil
- Apartadó, Colombia
- Apatzingan, Mexico
- Apucarana, Brazil
- Aqra, Chaldean Catholic Eparchy, Iraq
- Aracajú, Brazil
- Araçatuba, Brazil
- Araçuaí, Brazil
- Arauca, Colombia
- Arbil, see Erbil, Iraq
- Archipelago of the Comores (Archipel des Comores), Apostolic Vicariate, Comoros (& Mayotte)
- Ardagh, Ireland
- Arecibo, Puerto Rico
- Arequipa, Peru
- Arezzo-Cortona-Sansepolcro, Italy
- Argyll and the Isles, Scotland
- Ariano Irpino-Lacedonia, Italy
- Arica, Chile
- Arlington, United States
- Armagh, Northern Ireland
- Armenia, Colombia
- Armidale, Australia
- Arras, France
- Arua, Uganda
- Arundel and Brighton, United Kingdom
- Arusha, Tanzania
- Asansol, India
- Ascoli Piceno, Italy
- Asmara, Eritrean Catholic Archeparchy, Eritrea
- Assis, Brazil
- Assisi-Nocera Umbra-Gualdo Taldino, Italy
- Assiut, Coptic Catholic suffragan, Egypt
- Asti, Italy
- Astorga, Spain
- Asunción, Paraguay
- Atakpamé, Togo
- Atambua, Indonesia
- Athens, Greece
- Atlacomulco, Mexico
- Atlanta, United States
- Atyrau, Apostolic Administration, Kazakhstan
- Auch, France
- Auchi, Nigeria
- Auckland, New Zealand
- Augsburg, Germany
- Auki, Solomon Islands
- Aurangabad, India
- Austin, United States
- Autlán, Mexico
- Autun, France
- Aveiro, Portugal
- Avellaneda-Lanús, Argentina
- Avellino, Italy
- Aversa, Italy
- Avezzano, Italy
- Avignon, France
- Avila, Spain
- Awasa (Hawassa), Apostolic Vicariate, Ethiopia
- Awgu, Nigeria
- Awka, Nigeria
- Ayacucho, Peru
- Ayaviri, Territorial Prelature, Peru
- Aysén, Apostolic Vicariate, Chile
- Azogues, Ecuador
- Azul, Argentina
- Baalbek, Melkite*, Lebanon
- Baalbek – Deir El-Ahmar, Maronite*, Lebanon
- Bà Rịa, Vietnam
- Babahoyo, Ecuador
- Bacabal, Brazil
- Bắc Ninh, Vietnam
- Bacolod, Philippines
- Baku, Apostolic prefecture, (for all) Azerbaijan
- Badulla, Sri Lanka
- Bafang, Cameroon
- Bafatá, Guinea-Bissau
- Bafia, Cameroon
- Bafoussam, Cameroon
- Bagdogra, India
- Bagé, Brazil
- Baghdad (Armenian), Iraq
- Baghdad (Latin), Iraq
- Baguio, Philippines
- Bahía Blanca, Argentina
- Bahir Dar-Dessie, Ethiopian Catholic Eparchy, Ethiopia
- Baie-Comeau, Canada
- Baker, United States
- Balanga, Philippines
- Balasore, India
- Ballarat, Australia
- Balsas, Brazil
- Baltimore, United States
- Bamako, Mali
- Bambari, Central African Republic
- Bamberg, Germany
- Bamenda, Cameroon
- Bandung, Indonesia
- Banfora, Burkina Faso
- Bangalore, India
- Bangassou, Central African Republic
- Bangkok, Thailand
- Bangued, Philippines
- Bangui, Central African Republic
- Baní, Dominican Republic
- Baniyas, Melkite Catholic ?ArchEparchy, Lebanon
- Banja Luka, Bosnia and Herzegovina
- Banjarmasin, Indonesia
- Banjul, Gambia
- Banmaw, Myanmar
- Ban Mê Thuôt, Vietnam
- Banská Bystrica, Slovakia
- Baoding, China PR
- Baoqing (Paoking, Shaoyang), Apostolic prefecture, China PR
- Bar, Montenegro
- Barahona, Dominican Republic
- Barbastro–Monzón, Spain
- Barcelona, Spain
- Barcelona, Venezuela
- Bareilly, India
- Barentu, Eritrea
- Bari-Bitonto, Italy
- Barinas, Venezuela
- Baroda, India
- Barquisimeto, Venezuela
- Barra, Brazil
- Barra do Garças, Brazil
- Barra do Piraí–Volta Redonda, Brazil
- Barrancabermeja, Colombia
- Barranquilla, Colombia
- Barreiras, Brazil
- Barretos, Brazil
- Baruipur, India
- Basankusu, Democratic Republic of the Congo
- Basel, Switzerland
- Basse-Terre(-Pointe-à-Pitre), Guadeloupe (French)
- Bassorah, Basra, Chaldean Catholic ?Archeparchy, Iraq
- Bata, Equatorial Guinea
- Batanes, Territorial Prelature, Philippines
- Bathery, India
- Bathurst (in Australia), Australia
- Bathurst (in Canada), Canada
- Baton Rouge, United States
- Batouri, Cameroon
- Battambang, Apostolic Prefecture, Cambodia
- Batticaloa, Sri Lanka
- Baucau, Timor-Leste
- Bauchi, Nigeria
- Bauru, Brazil
- Bayeux, France
- Bayombong, Philippines
- Bayonne, France
- Beatissima Vergine Maria del SS.mo Rosario (Blessed Virgin of the Most Sacred Rosary) aka Pompei, Territorial Prelature, Brazil
- Beaumont, United States
- Beauvais-Noyons-Senlis, France
- Beihai, China
- Beijing, China
- Beira, Mozambique
- Beirut (Armenian), Armenian Catholic ?Archeparchy, Lebanon
- Beirut, Chaldean Catholic, Lebanon
- Beirut (Maronite), ?Archeparchy, Lebanon
- Beirut, Apostolic Vicariate, Latin, Lebanon
- Beirut and Byblos (Melkite), ?Archeparchy, Lebanon
- Beja, Portugal
- Belém do Pará, Brazil
- Belfort-Montbéliard, France
- Belgaum, India
- Belize City-Belmopan, Belize
- Bellary, India
- Belleville, United States
- Belley-Ars, France
- Belluno-Feltre, Italy
- Belo Horizonte, Brazil
- Belthangady, Syro-Malabar Catholic Eparchy, India
- Benevento, Italy
- Bengbu, China
- Benghazi, Apostolic Vicariate, Libya
- Benguela, Angola
- Benin City, Nigeria
- Benjamín Aceval, Paraguay
- Beograd, Serbia
- Berbérati, Central African Republic
- Bereina, Papua New Guinea
- Bergamo, Italy
- Berhampur, India
- Berlin, Germany
- Bertoua, Cameroon
- Besançon, France
- Bethlehem, South Africa
- Bettiah, India
- Bhadravathi, India
- Bhagalpur, India
- Bhopal, India
- Białystok, Poland
- Bida, Nigeria
- Biella, Italy
- Bielsko–Żywiec, Poland
- Bijnor, India
- Bilbao, Spain
- Biloxi, United States
- Birmingham, United Kingdom
- Birmingham, United States
- Bismarck, United States
- Bissau, Guinea-Bissau
- Bari-Bitonto, Italy
- Bjelovar-Križevci, Croatia
- Blantyre, Malawi
- Assumption of the Blessed Virgin Mary in Strumica-Skopje, Macedonian Catholic Eparchy, North Macedonia
- Blessed Virgin of the Most Sacred Rosary (Beatissima Vergine Maria del SS.mo Rosario) aka Pompei, Territorial Prelature, Brazil
- Bloemfontein, South Africa
- Blois, France
- Bluefields, Nicaragua
- Blumenau, Brazil
- Bo, Sierra Leone
- Boac, Philippines
- Bobo-Dioulasso, Burkina Faso
- Bocas del Toro, Territorial Prelature, Panama
- Bogor, Indonesia
- Bogotá, Colombia
- Boise, United States
- Bokungu–Ikela, Democratic Republic of the Congo
- Bologna, Italy
- Bolzano-Brixen, Italy
- Boma, Democratic Republic of the Congo
- Bomadi, Nigeria
- Bombay, India
- Bom Jesus da Lapa, Brazil
- Bom Jesus do Gurguéia, Brazil
- Bondo, Democratic Republic of the Congo
- Bondoukou, Ivory Coast (Côte d'Ivoire)
- Bonfim, Brazil
- Bongaigaon, India
- Bontoc-Lagawe, Apostolic Vicariate, Philippines
- Borba, Brazil
- Bordeaux, France
- Borongan, Philippines
- Bostra and Hauran, Melkite Greek Catholic Archeparchy, Syria
- Bossangoa, Central African Republic
- Boston, United States
- Botucatu, Brazil
- Bouaké, Côte d'Ivoire
- Bouar, Central African Republic
- Bougainville, Papua New Guinea
- Bourges, France
- Braga, Portugal
- Bragança do Pará, Brazil
- Bragança–Miranda, Portugal
- Bragança Paulista, Brazil
- Brasília, Brazil
- Bratislava, Slovakia
- Bratislava, Slovak Catholic Eparchy, Slovakia'
- Brazzaville, Republic of the Congo
- Breda, Netherlands
- Brejo, Brazil
- Brentwood, United Kingdom
- Brescia, Italy
- Bridgeport, United States
- Bridgetown, Barbados
- Brindisi–Ostuni, Italy
- Brisbane, Australia
- Brno, Czech Republic
- Broken Bay, Australia
- Brooklyn, United States
- Broome, Australia
- Brownsville, United States
- Bruges (Brugge), Belgium
- Brunei Darussalam, Apostolic Vicariate, Brunei
- Bubanza, Burundi
- Bucaramanga, Colombia
- Buchach, Ukrainian Catholic Eparchy, Ukraine
- București (Bucharest), Romania
- Budjala, Democratic Republic of the Congo
- Buéa, Cameroon
- Buenaventura, Colombia
- Buenos Aires, Argentina
- Buffalo, United States
- Buga, Colombia
- Bùi Chu, Vietnam
- Bujumbura, Burundi
- Bukavu, Democratic Republic of the Congo
- Bukoba, Tanzania
- Bulawayo, Zimbabwe
- Bunbury, Australia
- Bunda, Tanzania
- Bungoma, Kenya
- Bunia, Democratic Republic of the Congo
- Burgos, Spain
- Burlington, United States
- Bururi, Burundi
- Busan: see Pusan
- Buta, Democratic Republic of the Congo
- Butare, Rwanda
- Butembo-Beni, Democratic Republic of the Congo
- Butuan, Philippines
- Buxar, India
- Byblos, Maronite*, Lebanon
- Bydgoszcz, Poland
- Byumba, Rwanda
- Caacupé, Paraguay
- Cabanatuan, Philippines
- Cabimas, Venezuela
- Cabinda, Angola
- Caçador, Brazil
- Caceres, Philippines
- Cachoeira do Sul, Brazil
- Cachoeiro de Itapemirim, Brazil
- Cádiz y Ceuta, Spain
- Caetité, Brazil
- Cafayate, Territorial Prelature, Argentina
- Cagayan de Oro, Philippines
- Cagliari, Italy
- Caguas, Puerto Rico
- Cahors, France
- Caicó, Brazil
- Cairns, Australia
- Cairo (Maronites), Egypt
- Cairo (Chaldean Catholic), Egypt
- Cairo (Syrians), Egypt
- Cairo (Melkite), Territory Dependent on the Patriarch, Egypt
- Cajamarca, Peru
- Cajazeiras, Brazil
- Cajenna: see Cayenne
- Calabar, Nigeria
- Calabozo, Venezuela
- Calahorra y La Calzada–Logroño, Spain
- Calapan, Apostolic Vicariate, Philippines
- Calbayog, Philippines
- Calcutta, India
- Caldas, Colombia
- Calgary, Canada
- Cali, Colombia
- Calicut, India
- Callao, Peru
- Caltagirone, Italy
- Caltanissetta, Italy
- Camaçari, Brazil
- Camagüey, Cuba
- Cambrai, France
- Camden, United States
- Camerino–San Severino Marche, Italy
- Camiri, Apostolic Vicariate, Bolivia
- Campanha, Brazil
- Campeche, Mexico
- Camiri, Apostolic Vicariate, Bolivia
- Campina Grande, Brazil
- Campinas, Brazil
- Campobasso–Boiano, Italy
- Campo Grande, Brazil
- Campo Limpo, Brazil
- Campo Maior, Brazil
- Campo Mourão, Brazil
- Campos, Brazil
- Canada, Syrian Catholic Apostolic Exarchate, for all Canada
- Canberra and Goulburn, Australia
- Cancun-Chetumal, Territorial Prelature, Mexico
- Candia, Greece
- Canelones, Uruguay
- Cân Tho, Vietnam
- Caozhou, China
- Cape Coast, Ghana
- Cape Palmas, Liberia
- Cape Town, South Africa
- Cap-Haïtien, Haiti
- Capiz, Philippines
- Capua, Italy
- Carabayllo, Peru
- Caracas, Venezuela
- Caraguatatuba, Brazil
- Carapeguá, Paraguay
- Caratinga, Brazil
- Caravelí, Territorial Prelature, Peru
- Carcassonne et Narbonne, France
- Cardiff, United Kingdom
- Carolina, Brazil
- Caroline Islands, Federated States of Micronesia & Palau
- Caroní, Apostolic Vicariate, Venezuela
- Carora, Venezuela
- Carpi, Italy
- Cartagena, Colombia
- Cartagena, Spain
- Cartago, Colombia
- Cartago, Costa Rica
- Caruaru, Brazil
- Carúpano, Venezuela
- Casale Monferrato, Italy
- Cascavel, Brazil
- Caserta, Italy
- Cashel and Emly, Ireland
- Cassano all'Jonio, Italy
- Castanhal, Brazil
- Castellaneta, Italy
- Castries, Saint Lucia
- Catamarca, Argentina
- Catanduva, Brazil
- Catania, Italy
- Catanzaro–Squillace, Italy
- Catarman, Philippines
- Caucasus, Apostolic Administration at Tbilisi, Georgia
- Caxias do Maranhão, Brazil
- Caxias do Sul, Brazil
- Caxito, Angola
- Cayenne (Cajenna), French Guiana
- Cebu, Philippines
- Cefalù, Italy
- Celaya, Mexico
- Celje, Slovenia
- Cerignola–Ascoli Satriano, Italy
- Cerreto Sannita–Telese–Sant'Agata de' Goti, Italy
- Cesena-Sarsina, Italy
- České Budějovice, Czech Republic
- Chachapoyas, Peru
- Chaco Paraguayo, Apostolic Vicariate, Paraguay
- Chalan Kanoa, Northern Mariana Islands
- Chalatenango, El Salvador
- Châlons, France
- Chambéry–Saint-Jean-de Maurienne–Tarentaise, France
- Chanda, India
- Changanacherry, India
- Changde, China
- Changsha, China
- Chanthaburi, Thailand
- Chaotung (Zhaotong), Apostolic Prefecture, China PR
- Chapecó, Brazil
- Charleston, United States
- Charlotte, United States
- Charlottetown, Canada
- Chartres, France
- Chascomús, Argentina
- Cheju (Jeju), South Korea
- Chengde, China
- Chengdu, China
- Cheongju (Ch'ŏngju), South Korea
- Chernivtsi, Ukrainian Catholic Eparchy, Ukraine
- Cheyenne, United States
- Chiang Mai, Thailand
- Chiang Rai, Thailand
- Chiavari, Italy
- Chicago, United States
- Chiclayo, Peru
- Chicoutimi, Canada
- Chieti-Vasto, Italy
- Chifeng, China
- Chihuahua, Mexico
- Chikmagalur, India
- Chikwawa, Malawi
- Chilaw, Sri Lanka
- Chillán, Chile
- Chilpancingo–Chilapa, Mexico
- Chimbote, Peru
- Chimoio, Mozambique
- Chingleput, India
- Chinhoyi, Zimbabwe
- Chioggia, Italy
- Chios, Greece
- Chipata, Zambia
- Chiquinquirá, Colombia
- Chişinău, Moldova
- Chitré, Panama
- Chittagong, Bangladesh
- Choluteca, Honduras
- Chongqing, China
- Chŏnju: see Jeonju
- Ch'ŏngju: see Cheongju
- Chosica, Panama
- Chota, Territorial Prelature, Peru
- Christchurch, New Zealand
- Chulucanas, Peru
- Chunchun (Ch'unch'on/ Chuncheon/ Chunchon), North & South Korea
- Chuquibamba, Territorial Prelature, Peru
- Chuquibambilla, Territorial Prelature, Peru
- Chur, Switzerland
- Churchill-Baie d'Hudson, Canada
- Ciego de Avila, Cuba
- Cienfuegos, Cuba
- Cincinnati, United States
- Città di Castello, Italy
- Ciudad Altamirano, Mexico
- Ciudad Bolívar, Venezuela
- Ciudad del Este, Panama
- Ciudad Guayana, Venezuela
- Ciudad Guzmán, Mexico
- Ciudad Juárez, Mexico
- Ciudad Lázaro Cárdenas, Mexico
- Ciudad Obregón, Mexico
- Ciudad Quesada, Costa Rica
- Ciudad Real, Spain
- Ciudad Rodrigo, Spain
- Ciudad Valles, Mexico
- Ciudad Victoria, Mexico
- Civita Castellana, Italy
- Civitavecchia–Tarquinia, Italy
- Clermont, France
- Cleveland, United States
- Clifton, United Kingdom
- Clogher, Ireland
- Clonfert, Ireland
- Cloyne, Ireland
- Cluj-Gherla, Romania
- Coatzacoalcos, Mexico
- Cochabamba, Bolivia
- Cochin, India
- Coimbatore, India
- Coimbra, Portugal
- Colatina, Brazil
- Cologne, Germany
- Colima, Mexico
- Colombo, Sri Lanka & Maldives
- Colón–Kuna Yala, Panama
- Colorado Springs, United States
- Colombia, Maronite Catholic Apostolic Exarchate, for all Colombia
- Columbus, United States
- Comayagua, Honduras
- Como, Italy
- Comodoro Rivadavia, Argentina
- Conakry, Guinea
- Concepción, Chile
- Concepción, Argentina
- Concepción, Paraguay
- Concordia, Argentina
- Concordia-Pordenone, Italy
- Constantine, Algeria
- Conversano-Monopoli, Italy
- Copenhagen, Denmark
- Copiapó, Chile
- Córdoba, Argentina
- Córdoba, Spain
- Córdoba, Mexico
- Corfù–Zante–Cefalonia, Greece
- Coria–Cáceres, Spain
- Cork and Ross, Ireland
- Cornélio Procópio, Brazil
- Corner Brook and Labrador, Canada
- Coro, Venezuela
- Coroatá, Brazil
- Corocoro, Territorial Prelature, Bolivia
- Coroico, Bolivia
- Coronel Oviedo, Paraguay
- Corpus Christi, United States
- Corrientes, Argentina
- Corumbá, Brazil
- Cosenza–Bisignano, Italy
- Cotabato, Philippines
- Cotonou, Benin
- Coutances, France
- Covington, United States
- Coxim, Brazil
- Crateús, Brazil
- Crato, Brazil
- Crema, Italy
- Cremona, Italy
- Créteil, France
- Criciúma, Brazil
- Crimea (Krym), at Simferopol, Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Cristalândia, Brazil
- Crookston, United States
- Crotone–Santa Severina, Italy
- Cruz Alta, Brazil
- Cruz das Almas, Brazil
- Cruz del Eje, Argentina
- Cruzeiro do Sul, Brazil
- Cuauhtémoc-Madera, Mexico
- Cuautitlán, Mexico
- Cubao, Philippines
- Cúcuta, Colombia
- Cuddapah, India
- Cuenca, Ecuador
- Cuenca, Spain
- Cuernavaca, Mexico
- Cuiabá, Brazil
- Culiacán, Mexico
- Cumaná, Venezuela
- Cuneo, Italy
- Curitiba, Brazil
- Curitiba, São João Batista – (Ukrainian), Ukrainian Catholic Archeparchy, Brazil
- Curitiba, São João Batista – (Latin): See São João Batista em Curitiba
- Cuttack-Bhubaneswar, India
- Cuzco, Peru
- Cyangugu, Rwanda
- Cyprus (Maronite), at *, Cyprus
- Częstochowa, Poland
- Daegu: see Taegu
- Daejeon (Taejŏn), South Korea
- Daet, Philippines
- Dakar, Senegal
- Đakovo-Osijek, Croatia
- Dali, China PR
- Đà Lạt, Vietnam
- Dallas, United States
- Daloa, Côte d'Ivoire
- Daltonganj, India
- Damascus (Syriac)*, Syria
- Damascus (Maronite), Syria
- Daming, China
- Damongo, Ghana
- Đà Nẵng, Vietnam
- Danlí, Honduras
- Dapaong, Togo
- Dar es Salaam, Tanzania
- Darién, Apostolic Vicariate, Panama
- Darjeeling, India & Bhutan
- Daru-Kiunga, Papua New Guinea
- Darwin, Australia
- Dassa-Zoumé, Benin
- Datong, China
- Daule, Ecuador
- Davao, Philippines
- Davenport, United States
- David, Panama
- De Aar, South Africa
- Deán Funes, Territorial Prelature, Argentina
- Debrecen-Nyíregyháza, Hungary
- Dédougou, Burkina Faso
- Dedza, Malawi
- Delhi, India
- Denpasar, Indonesia
- Denver, United States
- Derna, Apostolic Vicariate, Libya
- Derry, Northern Ireland
- Des Moines, United States
- Detroit, United States
- Dhaka, Bangladesh
- Dharmapuri, India
- Diamantina, Brazil
- Diamantino, Brazil
- Diarbekir, Chaldean Catholic Archeparchy, Turkey
- Dibrugarh, India
- Diébougou, Burkina Faso
- Digne, France
- Digos, Philippines
- Dijon, France
- Díli, East Timor (Timor-Leste)
- Dinajpur, Bangladesh
- Dindigul, India
- Diphu, India
- Dipolog, Philippines
- Divinópolis, Brazil
- Djibouti, Djibouti
- Djougou, Benin
- Doba, Chad
- Dodoma, Tanzania
- Dodge City, United States
- Dolisie, Republic of the Congo
- Doko, Nigeria
- Donghai (Haichow / Haizhou), Apostolic prefecture, China PR
- Donetsk, Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Donkorkrom, Apostolic Vicariate, Ghana
- Dori, Burkina Faso
- Doruma–Dungu, Democratic Republic of the Congo
- Douala, Cameroon
- Doumé–Abong' Mbang, Cameroon
- Dourados, Brazil
- Down and Connor, Northern Ireland
- Dresden-Meißen, Germany
- Drohiczyn, Poland
- Dromore, Northern Ireland
- Dublin, Ireland
- Dubrovnik, Croatia
- Dubuque, United States
- Duitama-Sogamoso, Colombia
- Duluth, United States
- Dumaguete, Philippines
- Dumka, India
- Dundee, South Africa
- Dundo, Angola
- Dunedin, New Zealand
- Dunkeld, Scotland
- Duque de Caxias, Brazil
- Durango, Mexico
- Durban, South Africa
- East Anglia, United Kingdom
- Ebebiyin, Equatorial Guinea
- Ebolowa-Kribi, Cameroon
- Ecatepec, Mexico
- Edéa, Cameroon
- Edmonton, Canada
- Edmonton, Ukrainian Catholic Eparchy, Canada
- Edmundston, Canada
- Eger, Hungary
- Eichstätt, Germany
- Eisenstadt, Austria
- Ekiti, Nigeria
- El Alto, Bolivia
- El Banco, Colombia
- El Beni, Apostolic Vicariate, Bolivia
- Elbląg, Poland
- Eldoret, Kenya
- Ełk, Poland
- El Nayar (Jesús María d'), Territorial Prelature, Mexico
- El Obeid, Sudan
- El Paso, United States
- El Petén, Apostolic Vicariate, Guatemala
- Elphin, Ireland
- El Salto, Territorial Prelature, Mexico
- El Tigre, Venezuela
- Eluru, India
- El Vigia–San Carlos del Zulia, Venezuela
- Embu, Kenya
- Emdeber, Ethiopian Catholic Eparchy, Ethiopia
- Encarnación, Paraguay
- Ende, Indonesia
- Engativá, Colombia
- Ensenada, Mexico
- Enugu, Nigeria
- Erexim, Brazil
- Erfurt, Germany
- Erie, United States
- Ernakulam-Angamaly, Syro-Malabar Catholic Archeparchy, India
- Escuintla, Guatemala
- Eséka, Cameroon
- Eshowe, South Africa
- Esmeraldas, Apostolic Vicariate, Ecuador
- Espinal, Colombia
- Esquel, Territorial Prelature, Argentina
- Essen, Germany
- Estância, Brazil
- Estelí, Nicaragua
- Estonia, Apostolic Administration, at Tallinn, in and for all Estonia
- Esztergom-Budapest, Hungary
- Eunápolis, Brazil
- Evansville, United States
- Evinayong, Equatorial Guinea
- Évora, Portugal
- Évreux, France
- Évry-Corbeil-Essonnes, France
| - Facatativá, Colombia
- Fada N'Gourma, Burkina Faso
- Făgăraş (and Alba Iulia), Romanian 'Greek' Catholic Archeparchy, Romania
- Faenza–Modigliana, Italy
- Fairbanks, United States
- Faisalabad, Pakistan
- Fajardo-Humacao, Puerto Rico
- Falkland Islands, Apostolic Prefecture, Falkland Islands (UK)
- Fall River, United States
- Fano–Fossombrone–Cagli–Pergola, Italy
- Farafangana, Madagascar
- Fabriano–Matelica, Italy
- Fargo, United States
- Faridabad, Syro-Malabar Catholic Eparchy, India
- Faro, Portugal
- Feira de Santana, Brazil
- Feldkirch, Austria
- Fengxian, China
- Fenoarivo Atsinanana, Madagascar
- Fengyang, China
- Fermo, Italy
- Ferns, Ireland
- Ferrara-Comacchio, Italy
- Fianarantsoa, Madagascar
- Fidenza, Italy
- Fiesole, Italy
- Florence, Italy
- Florencia, Colombia
- Floresta, Brazil
- Floriano, Brazil
- Florianópolis, Brazil
- Florida, Uruguay
- Foggia-Bovino, Italy
- Foligno, Italy
- Fontibón, Colombia
- Forlì–Bertinoro, Italy
- Formosa(e), Argentina
- Formosa (Formosensis), Brazil
- Fortaleza, Brazil
- Fort-de-France, Martinique
- Fort-Liberté, Haiti
- Fort Portal, Uganda
- Fort Wayne-South Bend, United States
- Fort Worth, United States
- Fossano, Italy
- Foz do Iguaçu, Brazil
- Franca, Brazil
- Franceville, Gabon
- Francistown, Botswana
- Frascati, Italy
- Frederico Westphalen, Brazil
- Freetown, Sierra Leone
- Freiburg im Breisgau, Germany
- Fréjus-Toulon, France
- Fresno, United States
- Frosinone–Veroli–Ferentino, Italy
- Fukuoka, Japan
- Fulda, Germany
- Funchal, Portugal
- Funing, China
- Fushun, China
- Fuzhou, China
- Gaborone, Botswana
- Gaeta, Italy
- Gagnoa, Côte d'Ivoire
- Galápagos, Apostolic Vicariate, Botswana
- Galle, Sri Lanka
- Galloway, United Kingdom
- Gallup, United States
- Galveston-Houston, United States
- Galway and Kilmacduagh, Ireland
- Gambella, Apostolic Vicariate, Ethiopia
- Gamboma, Republic of the Congo
- Gandhinagar, India
- Ganzhou, China
- Gaoua, Burkina Faso
- Gap, France
- Garagoa, Colombia
- Garanhuns, Brazil
- Garissa, Kenya
- Garoua, Cameroon
- Gary, United States
- Garzón, Colombia
- Gaspé, Canada
- Gatineau, Canada
- Gaylord, United States
- Gbarnga, Liberia
- Gdańsk, Poland
- Geita, Tanzania
- Genova, Italy
- Gent: see Ghent
- Georgetown, Guyana
- Geraldton, Australia
- Getafe, Spain
- Ghent (Gent), Belgium
- Gibraltar, Gibraltar
- Gikongoro, Rwanda
- Girardot, Colombia
- Girardota, Colombia
- Girona, Spain
- Gitega, Burundi
- Gizo, Solomon Islands
- Glasgow, United Kingdom
- Gliwice, Poland
- Gniezno, Poland
- Goa and Daman, India
- Goaso, Ghana
- Goiânia, Brazil
- Goiás, Brazil
- Gokwe, Zimbabwe
- Goma, Democratic Republic of the Congo
- Gorakhpur, Syro-Malabar Eparchu, India
- Goré, Chad
- Gorizia, Italy
- Görlitz, Germany
- Goroka, Papua New Guinea
- Gospić–Senj, Croatia
- Governador Valadares, Brazil
- Goya, Argentina
- Gozo, Malta
- Grajaú, Brazil
- Granada, Spain
- Granada in Colombia, Colombia
- Granada, Nicaragua
- Grand-Bassam, Côte d'Ivoire
- Grand Falls, Canada
- Grand Island, United States
- Grand Rapids, United States
- Graz-Seckau, Austria
- Great Britain, Syro-Malabar Catholic Eparchy, England, Scotland & Wales (UK)
- Great Falls-Billings, United States
- Green Bay, United States
- Greensburg, United States
- Gregorio de Laferrere, Argentina
- Grenoble–Vienne, France
- Grodno, Belarus
- Groningen-Leeuwarden, Netherlands
- Grosseto, Italy
- Grouard-McLennan, Canada
- Guadalajara, Mexico
- Guadix, Spain
- Guajará-Mirim, Brazil
- Gualeguaychú, Argentina
- Guanare, Venezuela
- Guangzhou, China
- Guanhães, Brazil
- Guantánamo–Baracoa, Cuba
- Guapi, Apostolic Vicariate, Colombia
- Guarabira, Brazil
- Guaranda, Ecuador
- Guarapuava, Brazil
- Guarda, Portugal
- Guarenas, Venezuela
- Guarulhos, Brazil
- Guatemala, Guatemala
- Guaxupé, Brazil
- Guayaquil, Ecuador
- Gubbio, Italy
- Guide, China
- Guilian (Kweilin), Apostolic prefecture, China PR
- Guiratinga, Brazil
- Guiyang, China
- Guizeh, Coptic Catholic suffragan Eparchy, Egypt
- Gulbarga, India
- Gulu, Uganda
- Gumaca, Philippines
- Gumla, India
- Guntur, India
- Gurk, Austria
- Gurué, Mozambique
- Guwahati, India
- Gwalior, India
- Gwanju: see Kwanju
- Gweru, Zimbabwe
- Győr, Hungary
- Haarlem-Amsterdam, Netherlands
- La Habana, San Cristóbal de, Cuba
- Haichow (Donghai/ Haizhou), Apostolic prefecture, China PR
- Haifa, Maronite, Israel
- Haimen, China
- Hainan, Apostolic prefecture, China PR
- Hai Phòng, Vietnam
- Haizhou (Donghai/ Haichow), Apostolic prefecture, China PR
- Hajdúdorog, Hungarian Greek Catholic Archeparchy, Hungary
- Hakha, Myanmar
- Halifax, Canada
- Hallam, United Kingdom
- Hamburg, Germany
- Hamhung (Hamhŭng), North Korea
- Hamilton (in Bermuda), Bermuda
- Hamilton, Canada
- Hamilton, New Zealand
- Hangzhou, China
- Hankou, China
- Hà Nôi, Vietnam
- Hanyang, China
- Hanzhong, China
- Hap-an, Myanmar
- Harar, Apostolic Vicariate, Ethiopia
- Harare, Zimbabwe
- Harbin, Apostolic Administration, China PR
- Harbin, Russian Catholic Apostolic Exarchate, China PR
- Harrisburg, United States
- Hartford, United States
- Hassaké-Nisibi, Syrian Catholic ?Archeparchy, Syria
- Hasselt, Belgium
- Havana: see (San Cristóbal de) La Habana
- Hawassa (Awasa), Apostolic Vicariate, Ethiopia
- Hazaribag, India
- Hearst–Moosonee, Canada
- Helena, United States
- Helsinki, Finland
- Hengzhou, China
- Hermosillo, Mexico
- Hexham and Newcastle, United Kingdom
- Hildesheim, Germany
- Hinche, Haiti
- Hiroshima, Japan
- Ho, Ghana
- Ho Chi Minh City, Vietnam
- Hobart, Australia
- Hoima, Uganda
- Holguín, Cuba
- Holy Family of London, Ukrainian Catholic Eparchy for all Great Britain, UK
- Homa Bay, Kenya
- Homs (Melkite)*, Syria
- Homs (Syriac)*, Syria
- Hongdong, China PR
- Hong Kong, China PR (autonomous status)
- Honiara, Solomon Islands
- Honolulu, United States
- Hosanna, Apostolic Vicariate, Ethiopia
- Hosur (Syro-Malabar), India
- Houma-Thibodaux, United States
- Hradec Králové, Czech Republic
- Hsinchu, Taiwan
- Huacho, Peru
- Huajuapan de León, Mexico
- Huamachuco, Territorial Prelature, Peru
- Huambo, Angola
- Huancavélica, Peru
- Huancayo, Peru
- Huánuco, Peru
- Huautla, Territorial Prelature, Mexico
- Huaraz, Peru
- Huế, Vietnam
- Huehuetenango, Guatemala
- Huejutla, Mexico
- Huelva, Spain
- Huesca, Spain
- Humahuaca, Territorial Prelature, Argentina
- Humaitá, Brazil
- Hưng Hóa, Vietnam
- HHvar-Brac-Vis, Croatia
- Hwalien, Taiwan
- Hwange, Zimbabwe
- Hyderabad, India
- Hyderabad, Pakistan
- Iaşi, Romania
- Iba, Philippines
- Ibadan, Nigeria
- Ibagué, Colombia
- Ibarra, Ecuador
- Ibiza, Spain
- Ica, Peru
- Idah, Nigeria
- Idiofa, Democratic Republic of the Congo
- Idukki, India
- Ifakara, Tanzania
- Iglesias, Italy
- Iguatu, Brazil
- Ihosy, Madagascar
- Ijebu-Ode, Nigeria
- Ikot Ekpene, Nigeria
- Ilagan, Philippines
- (Iles) Saint-Pierre et Miquelon, Apostolic Vicariate, Saint-Pierre and Miquelon (French)
- Ilhéus, Brazil
- Iligan, Philippines
- Illapel, Territorial Prelature, Chile
- Ilorin, Nigeria
- Imaculada Conceição in Prudentópolis, Ukrainian Catholic Eparchy, Brazil
- Imola, Italy
- Imperatriz, Brazil
- Impfondo, Republic of the Congo
- Imphal, India
- Imus, Philippines
- Incheon (Inch'ŏn), South Korea
- Indianapolis, United States
- Indias Occidentales, Titular Patriarchal See of the East Indies, vested in Goa and Daman, at the primatial see of Goa, India
- Indore, India
- Infanta, Territorial Prelature, Philippines
- Ingwavuma, Apostolic Vicariate, South Africa
- Inhambane, Mozambique
- Inírida, Apostolic Vicariate, Colombia
- Innsbruck, Austria
- Inongo, Democratic Republic of the Congo
- Ipameri, Brazil
- Ipiales, Colombia
- Ipil, Philippines
- Iquique, Chile
- Iquitos, Apostolic Vicariate, Peru
- Irapuato, Mexico
- Irecê, Brazil
- Iringa, Tanzania
- Irinjalakuda, India
- Isangi, Democratic Republic of the Congo
- Isabela, Territorial Prelature, Philippines
- Ischia, Italy
- Isernia-Venafro, Italy
- Isiolo, Apostolic Vicariate, Kenya
- Isiro–Niangara, Democratic Republic of the Congo
- Iskanderiya: see Alexandria, Egypt
- Islamabad–Rawalpindi, Pakistan
- Islas Canarias, Spain
- Ispahan, Armenian Catholic Eparchy, Iran
- Issele-Uku, Nigeria
- Istanbul (Latin) (formerly Constantinople), Apostolic Vicariate, Turkey
- Istmina–Tadó, Colombia
- Itabira–Fabriciano, Brazil
- Itabuna, Brazil
- Itacoatiara, Territorial Prelature, Brazil
- Itaguaí, Brazil
- Itaituba, Territorial Prelature, Brazil
- Itanagar, India
- Itapetininga, Brazil
- Itapeva, Brazil
- Itapipoca, Brazil
- Ituiutaba, Brazil
- Itumbiara, Brazil
- Ivano-Frankivsk, Ukrainian Catholic Metropolitan Archeparchy, Ukraine
- Ivrea, Italy
- Izabal, Apostolic Vicariate, Guatemala
- Izcalli, Mexico
- Izmir, Turkey
- Jabalpur, India
- Jaboticabal, Brazil
- Jaca, Spain
- Jacarezinho, Brazil
- Jackson, United States
- Jacmel, Haiti
- Jaén, Spain
- Jaén en Perú (San Francisco Javier), Apostolic Vicariate, Peru
- Jaffna, Sri Lanka
- Jagdalpur, Syro-Malabar Catholic Eparchy, India
- Jaipur, India
- Jakarta, Indonesia
- Jalapa, Guatemala
- Jales, Brazil
- Jalingo, Nigeria
- Jalpaiguri, India
- Jammu-Srinagar, India
- Jamshedpur, India
- Janaúba, Brazil
- Januária, Brazil
- Jardim, Brazil
- Jaro, Philippines
- Jashpur, India
- Jasikan, Ghana
- Jataí, Brazil
- Jayapura, Indonesia
- Jefferson City, United States
- Jeju: Cheju
- Jelgava, Latvia
- Jeonju (Chŏnju), South Korea
- Jequié, Brazil
- Jérémie, Haiti
- Jerez de la Frontera, Spain
- Jericó, Colombia
- Jesi, Italy
- Jesús María ((d)El Nayar), Territorial Prelature, Mexico
- Jhabua, India
- Jhansi, India
- Jiamusi (Kiamusze), Apostolic prefecture, China PR
- Jiangmen, China
- Jian'ou (Jianning/ Kienning / Kienow), Apostolic prefecture, China PR
- Jilin, China
- Jimma–Bonga, Apostolic Vicariate, Ethiopia
- Jinan, China
- Jinja, Uganda
- Jinotega, Nicaragua
- Ji-Paraná, Brazil
- Jinzhou, China
- Joaçaba, Brazil
- Johannesburg, South Africa
- Joinville, Brazil
- Joliet in Illinois, United States
- Joliette, Canada
- Jolo, Apostolic Vicariate, Philippines
- Jos, Nigeria
- Jowai, India
- Juazeiro, Brazil
- Juba, Sudan
- Juigalpa, Nicaragua
- Juína, Brazil
- Juiz de Fora, Brazil
- Jujuy, Argentina
- Jalandhar, India
- Juli, Territorial Prelature, Peru
- Jundiaí, Brazil
- Juneau, United States
- (San Francisco de Asís de) Jutiapa, Guatemala
- Juticalpa, Honduras
- Kabale, Uganda
- Kabankalan, Philippines
- Kabgayi, Rwanda
- Kabinda, Democratic Republic of the Congo
- Kabwe, Zambia
- Kaduna, Nigeria
- Kafanchan, Nigeria
- Kaga–Bandoro, Central African Republic
- Kagoshima, Japan
- Kahama, Tanzania
- Kaifeng, China
- Kaišiadorys, Lithuania
- Kakamega, Kenya
- Kalamazoo, United States
- Kalay, Burma
- Kalemie–Kirungu, Democratic Republic of the Congo
- Kalibo, Philippines
- Kalisz, Poland
- Kalocsa–Kecskemét, Hungary
- Kalookan, Philippines
- Kalyan, India
- Kamichlié, Armenian Catholic Eparchy at Qamishli, Syria
- Kamina, Democratic Republic of the Congo
- Kamloops, Canada
- Kampala, Uganda
- Kamyanets-Podilsky, Ukraine
- Kamyanets-Podilskyi, Ukrainian Catholic Eparchy, Ukraine
- Kananga, Democratic Republic of the Congo
- Kandi, Benin
- Kandy, Sri Lanka
- Kangding, China
- Kanjirapally, Syro-Malabar Catholic Eparchy, India
- Kankan, Guinea
- Kannur, India
- Kano, Nigeria
- Kansas City, United States
- Kansas City-Saint Joseph, United States
- Kaohsiung, Taiwan
- Kaolack, Senegal
- Kaposvár, Hungary
- Kara, Togo
- Karachi, Pakistan
- Karaganda, Kazakhstan
- Karonga, Malawi
- Karwar, India
- Kasama, Zambia
- Kasana–Luweero, Uganda
- Kasese, Uganda
- Kasongo, Democratic Republic of the Congo
- Katiola, Côte d'Ivoire
- Katowice, Poland
- Kaunas, Lithuania
- Kavieng, Papua New Guinea
- Kaya, Burkina Faso
- Kayes, Mali
- Keetmanshoop, Namibia
- Keewatin-Le Pas, Canada
- Keimoes–Upington, South Africa
- Kenema, Sierra Leone
- Kenge, Democratic Republic of the Congo
- Kengtung, Myanmar
- Keningau, Malaysia
- Kerema, Papua New Guinea
- Keren (Eritrean Catholic epearchy), Eritrea
- Kericho, Kenya
- Kerkūk (Chaldean archeparchy), Iraq
- Kerry, Ireland
- Keta-Akatsi, Ghana
- Ketapang, Indonesia
- Khadki, Saint Ephrem of -, Syro-Malankara Catholic Exarchate, India
- Khammam, India
- Khandwa, India
- Kharkiv, Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Kharkiv-Zaporizhzhia, Ukraine
- Khartoum, Sudan
- Khulna, Bangladesh
- Khunti, India
- Kiamusze (Jiamusi), Apostolic prefecture, China PR
- Kiayi, Taiwan
- Kibungo, Rwanda
- Kidapawan, Philippines
- Kielce, Poland
- Kienning (Jianning/ Jian'ou / Kienow), Apostolic prefecture, China PR
- Kigali, Rwanda
- Kigoma, Tanzania
- Kikwit, Democratic Republic of the Congo
- Kildare and Leighlin, Ireland
- Killala, Ireland
- Killaloe, Ireland
- Kilmore, Ireland & United Kingdom
- Kilwa–Kasenga, Democratic Republic of the Congo
- Kimbe, Papua New Guinea
- Kimberley, South Africa
- Kindu, Democratic Republic of the Congo
- Kingston, Canada
- Kingston in Jamaica, Jamaica
- Kingstown, Saint Vincent and Grenadines
- Kinkala, Republic of the Congo
- Kinshasa, Democratic Republic of the Congo
- Kisangani, Democratic Republic of the Congo
- Kisantu, Democratic Republic of the Congo
- Kisii, Kenya
- Kisumu, Kenya
- Kitale, Kenya
- Kitui, Kenya
- Kiyinda–Mityana, Uganda
- Klerksdorp, South Africa
- Knoxville, United States
- København: see Copenhagen
- Koforidua, Ghana
- Kohima, India
- Kokstad, South Africa
- Kolda, Senegal
- Kole, Democratic Republic of the Congo
- Kolomyia, Ukrainian Catholic Eparchy, Ukraine
- Kolwezi, Democratic Republic of the Congo
- Kompong Cham, Apostolic prefecture, Cambodia
- Kondoa, Tanzania
- Kongolo, Democratic Republic of the Congo
- Konongo–Mampong, Ghana
- Kontagora, Nigeria
- Kontum, Vietnam
- Koper, Slovenia
- Korhogo, Côte d'Ivoire
- Košice, Slovakia
- Košice, Slovak Catholic Eparchy, Slovakia
- Koszalin-Kołobrzeg, Poland
- Kota Kinabalu, Malaysia
- Kothamangalam, India
- Kotido, Uganda
- Kotor, Montenegro
- Kottapuram, India
- Kottar, India
- Kottayam, India
- Koudougou, Burkina Faso
- Koupéla, Burkina Faso
- Kpalimé, Togo
- Kraków, Poland
- Krishnagar, India
- Križevci (Croatian Catholic eparchy), Croatia
- Krk, Croatia
- Kroonstad, South Africa
- Krym (Crimea), at Simferopol, Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Kuala Lumpur, Malaysia
- Kuching, Malaysia
- Kumasi, Ghana
- Kumbakonam, India
- Kumba, Cameroon
- Kundiawa, Papua New Guinea
- Kunming, China
- Kupang, Indonesia
- Kurnool, India
- Kurunegala, Sri Lanka
- Kuzhithurai, India
- Kwangju (Gwanju), South Korea
- Kweilin (Guilian), Apostolic prefecture, China PR
- Kwito-Bié, Angola
- Kyiv (Kiev, Kiew), Ukrainian Catholic (proper Metropolitanate of the Major Archdiocese), Ukraine
- Kyiv–Halych (at Kiev, Kiew), the Ukrainian Catholic Major Archdiocese, Ukraine
- Kyiv–Zhytomyr, Ukraine
- Kyoto, Japan
- Kyrgyzstan, Apostolic Administration, at Bishkek, in and for all Kyrgyzstan
- La Crosse, United States
- Lábrea, Territorial Prelature, Brazil
- La Dorada-Guaduas, Colombia
- Lae, Papua New Guinea
- Lafayette in Indiana, United States
- Lafayette in Louisiana, United States
- Lafia, Nigeria
- Lages, Brazil
- Laghouat, Algeria
- Lagos, Nigeria
- La Guaira, Venezuela
- Lahore, Pakistan
- Lai, Chad
- Lake Charles, United States
- Lamego, Portugal
- Lamezia Terme, Italy
- Lancaster, United Kingdom
- Lanciano-Ortona, Italy
- Lạng Sơn and Cao Bằng, Vietnam
- Langres, France
- Lansing, United States
- Lanusei, Italy
- Lanzhou, China
- Laoag, Philippines
- Laohekou, China
- La Paz, Bolivia
- La Paz en la Baja California Sur, Mexico
- La Plata, Argentina
- L'Aquila, Italy
- Larantuka, Indonesia
- Laredo, United States
- La Rioja, Argentina
- La Rochelle, France
- Las Cruces, United States
- La Serena, Chile
- Lashio, Myanmar
- La Spezia–Sarzana–Brugnato, Italy
- Las Vegas, United States
- Latacunga, Ecuador
- Latakia, Maronite Eparchy, Syria
- Latakia (Melkites), Syria
- Latina–Terracina–Sezze–Priverno, Italy
- Lausanne, Genève et Fribourg, Switzerland
- Laval, France
- La Vega, Dominican Republic
- Lecce, Italy
- Leeds, United Kingdom
- Legazpi, Philippines
- Legnica, Poland
- Le Havre, France
- Leiria–Fátima, Portugal
- Le Mans, France
- León, Spain
- León, Mexico
- León, Nicaragua
- Leopoldina, Brazil
- Le Puy-en-Velay, France
- Leribe, Lesotho
- Les Cayes, Haiti
- Les Gonaïves, Haiti
- Leticia, Apostolic Vicariate, Colombia
- Lexington, United States
- Lezhë, Albania
- Líbano-Honda, Colombia
- Libmanan, Philippines
- Libreville, Gabon
- Lichinga, Mozambique
- Liège, Belgium
- Liepāja, Latvia
- Lille, France
- Lilongwe, Malawi
- Lima, Peru
- Limburg, Germany
- Limeira, Brazil
- Limerick, Ireland
- Limoeiro do Norte, Brazil
- Limoges, France
- Limón, Costa Rica
- Linares, Mexico
- Linares, Chile
- Lincoln, United States
- Lindi, Tanzania
- Lingayen-Dagupan, Philippines
- Lins, Brazil
- Linz, Austria
- Lipa, Philippines
- Lira, Uganda
- Lisala, Democratic Republic of the Congo
- Lisbon, Portugal
- Lishui, China
- Lismore, Australia
- Litoměřice, Czech Republic
- Little Rock, United States
- Liverpool, United Kingdom & Isle of Man
- Livingstone, Zambia
- Livorno, Italy
- Livramento de Nossa Senhora, Brazil
- Ljubljana, Slovenia
- Lleida, Spain
- Locri-Gerace, Italy
- Lodi, Italy
- Lodwar, Kenya
- Łódź, Poland
- Loikaw, Myanmar
- Loja, Ecuador
- Lokoja, Nigeria
- Lokossa, Benin
- Lolo, Democratic Republic of the Congo
- Lomas de Zamora, Argentina
- Lomé, Togo
- Łomża, Poland
- London, Canada
- London, Holy Family of, Ukrainian Catholic Eparchy for all Great Britain, UK
- Londrina, Brazil
- Long Xuyên, Vietnam
- Lorena, Brazil
- Loreto, Territorial Prelature, Italy
- Los Altos, Quetzaltenango–Totonicapán, Guatemala
- Los Ángeles, Chile
- Los Angeles, United States
- Los Teques, Chile
- Louisville, United States
- Łowicz, Poland
- Luoyang, China
- Lu'an, China
- Luanda, Angola
- Luang Prabang, Apostolic Vicariate, Laos
- Lubango, Angola
- Lubbock, United States
- Lublin, Poland
- Lubumbashi, Democratic Republic of the Congo
- Lucca, Italy
- Lucena, Philippines
- Lucera-Troia, Italy
- Lucknow, India
- Luçon, France
- Luebo, Democratic Republic of the Congo
- Lugano, Switzerland
- Lugazi, Uganda
- Lugo, Spain
- Lugoj, Romania
- Luiza, Democratic Republic of the Congo
- Lulong, China
- Lungro, Italo-Albanese Eparchy, Italy
- Luoyang, China
- Lurín, Peru
- Lusaka, Zambia
- Lutsk (Latin), Ukraine
- Lutsk, Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Luxembourg, Luxembourg
- Luz, Brazil
- Luziânia, Brazil
- Lviv (Armenian), Ukraine
- Lviv (Latin), Ukraine
- Lviv, Ukrainian Catholic Metropolitanate, Ukraine
- Lwena, Angola
- Lyon, France
| - Maasin, Philippines
- Macau, Macao
- Macapá, Brazil
- Maceió, Brazil
- Macerata–Tolentino–Recanati–Cingoli–Treia, Italy
- Machakos, Kenya
- Machala, Ecuador
- Machiques, Venezuela
- Mackenzie-Fort Smith, Canada
- Madang, Papua New Guinea
- Madison, United States
- Madras and Mylapore, India
- Madrid, Spain
- Madurai, India
- Magangué, Colombia
- Magdeburg, Germany
- Mahagi-Nioka, Democratic Republic of the Congo
- Mahajanga, Madagascar
- Mahenge, Tanzania
- Maiduguri, Nigeria
- Mainz, Germany
- Maitland-Newcastle, Australia
- Majorca, Spain
- Makokou, Apostolic Vicariate, Gabon
- Makassar, Indonesia
- Makeni, Sierra Leone
- Makurdi, Nigeria
- Malabo, Equatorial Guinea
- Málaga, Spain
- Málaga-Soatá, Colombia
- Malakal, Sudan
- Malang, Indonesia
- Malanje, Angola
- Malaybalay, Philippines
- Maldonado-Punta del Este, Uruguay
- Maliana, Timor-Leste
- Malindi, Kenya
- Malolos, Philippines
- Malta, Malta
- Mamfe, Cameroon
- Man, Côte d'Ivoire
- Manado, Indonesia
- Managua, Nicaragua
- Mananthavady (Syro-Malabar), India
- Mananjary, Madagascar
- Manaus, Brazil
- Manchester, United States
- Mandalay, Myanmar
- Mandeville, Jamaica
- Mandya (Syro-Malabar), India
- Manfredonia–Vieste–San Giovanni Rotondo, Italy
- Manga, Burkina Faso
- Mangochi, Malawi
- Mangalore, India
- Mangochi, Malawi
- Manila, Philippines
- Manizales, Colombia
- Mannar, Sri Lanka
- Manokwari-Sorong, Indonesia
- Manono, Democratic Republic of the Congo
- Mansa, Zambia
- Mantova, Italy
- Manzini, Swaziland
- Mao-Monte Cristi, Dominican Republic
- Maputo, Mozambique
- Marabá, Brazil
- Maracaibo, Venezuela
- Maracay, Venezuela
- Mar Addai of Toronto, Chaldean Catholic eparchy, Canada
- Maradi, Niger
- Marajó, Territorial Prelature, Brazil
- Maralal, Kenya
- Maramureş, Romania
- Marawi, Territorial Prelature, Philippines
- Marbel, Philippines
- Mar del Plata, Argentina
- Maribor, Slovenia
- Margarita, Venezuela
- Mariana, Brazil
- Mariannhill, South Africa
- Marília, Brazil
- Maringá, Brazil
- Maroua-Mokolo, Cameroon
- Marquette, United States
- Marsabit, Kenya
- Marseille, France
- Marshall Islands, Apostolic prefecture, Marshall Islands
- Marthandom (Syro-Malankara), India
- Mary Most Holy in Astana, Kazakhstan
- Masaka, Uganda
- Masan, South Korea
- Maseru, Lesotho
- Massa Carrara-Pontremoli, Italy
- Massa Marittima-Piombino, Italy
- Masvingo, Zimbabwe
- Matadi, Democratic Republic of the Congo
- Matagalpa, Nicaragua
- Matamoros, Mexico
- Matanzas, Cuba
- Matehuala, Mexico
- Matera-Irsina, Italy
- Mati, Philippines
- Maturín, Venezuela
- Maumere, Indonesia
- Mavelikara (Syro-Malankara), India
- Mawlamyine, Myanmar
- Mayagüez, Puerto Rico
- Mazara del Vallo, Italy
- Mazatlán, Mexico
- Mbaïki, Central African Republic
- Mbalmayo, Cameroon
- Mbandaka-Bikoro, Democratic Republic of the Congo
- Mbanza Congo, Angola
- Mbarara, Uganda
- Mbeya, Tanzania
- Mbinga, Tanzania
- Mbujimayi, Democratic Republic of the Congo
- Mbulu, Tanzania
- Meath, Ireland
- Meaux, France
- Mechelen-Brussel, Belgium
- Medan, Indonesia
- Medellín, Colombia
- Meerut, India
- Meki, Apostolic Vicariate, Ethiopia
- Melaka-Johor, Malaysia
- Melbourne, Australia
- Melbourne, Saints Peter and Paul of, Ukrainian Catholic Eparchy, Australia
- Melfi-Rapolla-Venosa, Italy
- Melipilla, Chile
- Melo, Uruguay
- Memphis, United States
- Mende, France
- Méndez, Apostolic Vicariate, Ecuador
- Mendi, Papua New Guinea
- Mendoza, Argentina
- Menevia, United Kingdom
- Menongue, Angola
- Menorca, Spain
- Merauke, Indonesia
- Mercedes, Uruguay
- Mercedes-Luján, Argentina
- Mérida, Venezuela
- Mérida-Badajoz, Spain
- Merlo-Moreno, Argentina
- Meru, Kenya
- Messina-Lipari-Santa Lucia del Mela, Italy
- Metuchen, United States
- Metz, France
- Mexicali, Mexico
- Mexico, Mexico
- Miami, United States
- Miao, India
- Miarinarivo, Madagascar
- Middlesbrough, United Kingdom
- Milano, Italy
- Mileto-Nicotera-Tropea, Italy
- Milwaukee, United States
- Minas, Uruguay
- Mindelo, Cape Verde
- Minna, Nigeria
- Minsk–Mohilev, Belarus
- Minya, Egypt
- Miracema do Tocantins, Brazil
- Miri, Malaysia
- Mississauga (Syro-Malabar eparchy), Canada
- Mission de France at Pontigny, Territorial Prelature, France
- Misurata, Apostolic prefecture, Libya
- Mitú, Apostolic Vicariate, Colombia
- Mixes, Territorial Prelature, Mexico
- Mobile, United States
- Mocoa-Sibundoy, Colombia
- Modena-Nonantola, Italy
- Mogadiscio, Somalia
- Mogi das Cruzes, Brazil
- Mohale's Hoek, Lesotho
- Molegbe, Democratic Republic of the Congo
- Molfetta-Ruvo-Giovinazzo-Terlizzi, Italy
- Mombasa, Kenya
- Monaco, Monaco
- Moncton, Canada
- Mondoñedo–Ferrol, Spain
- Mondovì, Italy
- Mongo, Apostolic Vicariate, Chad
- Mongomo, Equatorial Guinea
- Mongu, Zambia
- Monreale, Italy
- Monrovia, Liberia
- Montauban, France
- Montego Bay, Jamaica
- Montelíbano, Colombia
- Montenegro, Brazil
- Montepulciano-Chiusi-Pienza, Italy
- Monterey in California, United States
- Montería, Colombia
- Monterrey, Mexico
- Montes Claros, Brazil
- Montevideo, Uruguay
- Mont-Laurier, Canada
- Montpellier, France
- Montreal, Canada
- Monze, Zambia
- Mopti, Mali
- Moramanga, Madagascar
- Morelia, Mexico
- Morogoro, Tanzania
- Morombe, Madagascar
- Morón, Argentina
- Morondava, Madagascar
- Moroto, Uganda
- Moshi, Tanzania
- Mossoró, Brazil
- Mosul (Chaldean), Iraq
- Mosul (Syriac), Iraq
- Mostar–Duvno, Bosnia and Herzegovina
- Most Holy Trinity in Almaty, Kazakhstan
- Mother of God at Moscow, Russia
- Motherwell, United Kingdom
- Mouila, Gabon
- Moulins, France
- Moundou, Chad
- Mount Hagen, Papua New Guinea
- Moyobamba, Territorial Prelature, Peru
- Mpanda, Tanzania
- Mpika, Zambia
- Mtwara, Tanzania
- Mukachevo (Ruthenian), Ukraine
- Mukachevo (Latin), Ukraine
- Multan, Pakistan
- Munich and Freising, Germany
- Münster, Germany
- Murang'a, Kenya
- Murska Sobota, Slovenia
- Musoma, Tanzania
- Mutare, Zimbabwe
- Muvattupuzha (Syro-Malankara eparchy), India
- Muyinga, Burundi
- Muzaffarpur, India
- Mwanza, Tanzania
- Mweka, Democratic Republic of the Congo
- Myitkyina, Myanmar
- Mymensingh, Bangladesh
- Mysore, India
- Mỹ Tho, Vietnam
- Mzuzu, Malawi
- Nacala, Mozambique
- Nagasaki, Japan
- Nagoya, Japan
- Nagpur, India
- Naha, Japan
- Nairobi, Kenya
- Nakhon Ratchasima, Thailand
- Nakhon Sawan, Thailand
- Nakuru, Kenya
- Nalgonda, India
- Nampula, Mozambique
- Namur, Belgium
- Nanchang, China
- Nancheng, China
- Nancy, France
- Nanjing, China
- Nanlong, China
- Nanning, China
- Nanterre, France
- Nantes, France
- Nanyang, China
- Napoli (Naples), Italy
- Napo, Apostolic Vicariate, Ecuador
- Nardò – Gallipoli, Italy
- Nashik, India
- Nashville, United States
- Nassau, Bahamas
- Natal, Brazil
- Natitingou, Benin
- Naval, Philippines
- Naviraí, Brazil
- Navrongo–Bolgatanga, Ghana
- Naxos–Andros–Tinos–Mykonos, Greece
- Nayar, Jesús María del, Territorial Prelature, Mexico
- Nazaré, Brazil
- Ndalatando, Angola
- N'Dali, Benin
- N'Djamena, Chad
- Ndola, Zambia
- Nebbi, Uganda
- Neiva, Colombia
- Nekemte, Apostolic Vicariate, Ethiopia
- Nellore, India
- Nelson, Canada
- Nepal, Apostolic Vicariate (in Kathmandu), Nepal
- Neuquén, Argentina
- Nevers, France
- Newark, United States
- New Orleans, United States
- New Ulm, United States
- New Westminster, Canada
- New Westminster, Ukrainian Catholic Eparchy, Canada
- New York, United States
- Neyyattinkara, India
- Nezahualcóyotl, Mexico
- Ngaoundéré, Cameroon
- Ngong, Kenya
- Ngozi, Burundi
- Nha Trang, Vietnam
- Niamey, Niger
- Nice, France
- Nicolet, Canada
- 'Nicopolis, Bulgaria
- Nicosia, Italy
- Niigata, Japan
- Nikopol, Bulgaria
- Nîmes, France
- Ningbo, China
- Ningxia, China
- Ningyaun, China
- Niterói, Brazil
- Nitra, Slovakia
- Njombe, Tanzania
- Nkayi, Republic of the Congo
- Nkongsamba, Cameroon
- Nnewi, Nigeria
- Nocera Inferiore-Sarno, Italy
- Nogales, Mexico
- Nola, Italy
- Nongstoin, India
- Northampton, United Kingdom
- Northern Arabia, Apostolic Vicariate, in Kuwait City, Kuwait
- Norwich, United States
- Nossa Senhora do Líbano em São Paulo, Maronite Eparchy, Brazil
- Nossa Senhora do Paraíso em São Paulo (Melkite), Brazil
- Noto, Italy
- Notre-Dame du Liban de Paris, Maronite Eparchy, France
- Nottingham, United Kingdom
- Nouakchott, Mauritania
- Nouméa, New Caledonia
- Nouna, Burkina Faso
- Nova Friburgo, Brazil
- Nova Iguaçu, Brazil
- Novaliches, Philippines
- Novara, Italy
- Novo Hamburgo, Brazil
- Novo Mesto, Slovenia
- Nsukka, Nigeria
- Nuestra Señora de la Altagracia en Higüey, Dominican Republic
- Nuestra Señora de los Mártires del Líbano en México (Maronite), Maronite*, Mexico
- Nuestra Señora del Paraíso en México (Melkite)*, Mexico
- Nueva Pamplona, Colombia
- Nueva Segovia, Philippines
- Nueve de Julio, Argentina
- Nuevo Casas Grandes, Mexico
- Nuevo Laredo, Mexico
- Ñuflo de Chávez, Apostolic Vicariate, Bolivia
- Nuoro, Italy
- Nyahururu, Kenya
- Nyeri, Kenya
- Nyundo, Rwanda
- N'Zérékoré, Guinea
- Oakland, United States
- Obala, Cameroon
- Oberá, Argentina
- Óbidos, Brazil
- Obuasi, Ghana
- Ocaña, Colombia
- Odesa, Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Odesa-Simferopol (Latin), Ukraine
- Odienné, Côte d'Ivoire
- Oeiras, Brazil
- Ogdensburg, United States
- Ogoja, Nigeria
- Oita, Japan
- Okigwe, Nigeria
- Oklahoma City, United States
- Olinda e Recife, Brazil
- Oliveira, Brazil
- Olomouc, Czech Republic
- Omaha, United States
- Ondjiva, Angola
- Ondo, Nigeria
- Onitsha, Nigeria
- Ootacamund, India
- Opole, Poland
- Oppido Mamertina-Palmi, Italy
- Oradea Mare, Romania
- Oran, Algeria
- Orán, Argentina
- Orange, United States
- Orense, Spain
- Oria, Italy
- Orihuela–Alicante, Spain
- Oristano, Italy
- Orizaba, Mexico
- Orlando, United States
- Orléans, France
- Orlu, Nigeria
- Oruro, Bolivia
- Orvieto-Todi, Italy
- Osaka, Japan
- Osasco, Brazil
- Oslo, Norway
- Osma-Soria, Spain
- Osnabrück, Germany
- Osogbo, Nigeria
- Osório, Brazil
- Osorno, Chile
- Ossory, Ireland
- Ostia, Italy
- Ostrava-Opava, Czech Republic
- Otranto, Italy
- Ottawa, Canada
- Otukpo, Nigeria
- Ouagadougou, Burkina Faso
- Ouahigouya, Burkina Faso
- Oudtshoorn, South Africa
- Ouesso, Republic of the Congo
- Ourinhos, Brazil
- Our Lady of Deliverance of Newark, United States
- Our Lady of Lebanon of Los Angeles, Maronite Eparchy*, United States
- Our Lady of Nareg in Glendale, Armenian Catholic, United States
- Oviedo, Spain
- Owando, Republic of the Congo
- Owensboro, United States
- Owerri, Nigeria
- Oyem, Gabon
- Oyo, Nigeria
- Ozamiz, Philippines
- Ozieri, Italy
- Padang, Indonesia
- Paderborn, Germany
- Padova, Italy
- Pagadian, Philippines
- Paisley, United Kingdom
- Pakse (Paksé), Apostolic Vicariate, Laos
- Pala, Chad
- Palai, India
- Palangkaraya, Indonesia
- Palayamkottai, India
- Palembang, Indonesia
- Palencia, Spain
- Palermo, Italy
- Palestrina, Italy
- Palghat, Syro-Malabar Eparchy, India
- Palmares, Brazil
- Palmas, Brazil
- Palmas–Francisco Beltrão, Brazil
- Palm Beach, United States
- Palmeira dos Índios, Brazil
- Palmerston North, New Zealand
- Palmira, Colombia
- Palo, Philippines
- Pamiers, France
- Pamplona y Tudela, Spain
- Panamá, Panama
- Pando, Apostolic Vicariate, Bolivia
- Panevėžys, Lithuania
- Pankshin, Nigeria
- Pannonhalma, Territorial Abbacy, Hungary
- Paoking (Baoqing, Shaoyang), Apostolic prefecture, China PR
- Papantla, Mexico
- Papeete, French Polynesia (& Pitcairn Islands)
- Paracatu, Brazil
- Paraíba, Brazil
- Parakou, Benin
- Paramaribo, Suriname
- Paraná, Argentina
- Paranaguá, Brazil
- Parañaque, Philippines
- Paranavaí, Brazil
- Parassala, Syro-Malankara Catholic Eparchy, India
- Parintins, Brazil
- Paris, France
- Parma, Italy
- Parma (Ruthenian), United States
- Parma (Ukrainian), United States
- Parnaíba, Brazil
- Parral, Mexico
- Parramatta, Australia
- Pasig, Philippines
- Passaic (Ruthenian)*, Eparchy United States
- Passau, Germany
- Passo Fundo, Brazil
- Pasto, Colombia
- Paterson, United States
- Pathanamthitta, Syro-Malankara Catholic Eparchy, India
- Pathein, Myanmar
- Patna, India
- Patos, Brazil
- Patos de Minas, Brazil
- Patti, Italy
- Paulo Afonso, Brazil
- Pavia, Italy
- Pécs, Hungary
- Pekhon, Myanmar
- Pelotas, Brazil
- Pelplin, Poland
- Pemba, Mozambique
- Pembroke, Canada
- Penang, Malaysia
- Penedo, Brazil
- Penonomé, Panama
- Pensacola-Tallahassee, United States
- Peoria, United States
- Pereira, Colombia
- Périgueux, France
- Perpignan-Elne, France
- Perth, Australia
- Perugia–Città della Pieve, Italy
- Pesaro, Italy
- Pescara-Penne, Italy
- Pescia, Italy
- Pesqueira, Brazil
- Petare, Venezuela
- Peterborough, Canada
- Petra and Philadelphia, Melkite*, Jordan
- Petrolina, Brazil
- Petrópolis, Brazil
- Phan Thiết, Vietnam
- Phát Diêm, Vietnam
- Philadelphia (Latin Church), United States
- Philadelphia (Ukrainian Catholic), United States
- Phnom Penh, Apostolic Vicariate, Cambodia
- Phoenix (Latin Church), United States
- Phoenix (Ruthenian*), United States
- Phú Cường, Vietnam
- Piacenza-Bobbio, Italy
- Piana degli Albanesi, Italo-Albanese Eparchy, Italy
- Piazza Armerina, Italy
- Picos, Brazil
- Piedras Negras, Mexico
- Pietersburg, South Africa
- Pilcomayo, Apostolic Vicariate, Paraguay
- Pinar del Río, Cuba
- Pinerolo, Italy
- Pingliang, Cuba
- Pinheiro, Brazil
- Pinsk, Belarus
- Piracicaba, Brazil
- Pisa, Italy
- Pistoia, Italy
- Pitigliano-Sovana-Orbetello, Italy
- Pittsburgh (Latin Church), United States
- Pittsburgh (Ruthenian Catholic Byzantine), United States
- Piura, Peru
- Plasencia, Spain
- Płock, Poland
- Plymouth, United Kingdom
- Plzeň, Czech Republic
- Plymouth, United States
- Pointe-à-Pitre: see united see Basse-Terre(-Pointe-à-Pitre)
- Pointe-Noire, Republic of the Congo
- Poitiers, France
- Pompei aka Beatissima Vergine Maria del SS.mo Rosario (Blessed Virgin of the Most Sacred Rosary), Territorial Prelature, Brazil
- Ponce, Puerto Rico
- Pondicherry and Cuddalore, India
- Ponta de Pedras, Brazil
- Ponta Grossa, Brazil
- Pontianak, Indonesia
- Pontigny (Mission de France), Territorial Prelature, France
- Pontoise, France
- Poona, India
- Popayán, Colombia
- Popokabaka, Democratic Republic of the Congo
- Poreč i Pula, Croatia
- Portalegre–Castelo Branco, Portugal
- Port-au-Prince, Haiti
- Port-Bergé, Madagascar
- Port Blair, India
- Port-de-Paix, Haiti
- Port Elizabeth, South Africa
- Port-Gentil, Gabon
- Port Hartcourt, Nigeria
- Portland in Oregon, United States
- Portland in Maine, United States
- Port-Louis, Mauritius
- Port Moresby, Papua New Guinea
- Porto, Portugal
- Porto Alegre, Brazil
- Port of Spain, Trinidad and Tobago
- Porto Nacional, Brazil
- Porto Novo, Benin
- Porto-Santa Rufina, Italy
- Porto Velho, Brazil
- Portoviejo, Ecuador
- Port Pirie, Australia
- Portsmouth, United Kingdom
- Port Victoria, Seychelles
- Port-Vila, Vanuatu
- Posadas, Argentina
- Potenza-Muro Lucano-Marsico Nuovo, Italy
- Potosí, Bolivia
- Pouso Alegre, Brazil
- Požega, Croatia
- Poznań, Poland
- Pozzuoli, Italy
- Prague (Praha), Czech Republic
- Prato, Italy
- Presidente Prudente, Brazil
- Prešov, Slovak Catholic Archeparchy, Metropolitanate sui juris, Slovakia
- Pretoria, South Africa
- Prince-Albert, Canada
- Prince George, Canada
- Prizren-Priština, Kosovo
- Propriá, Brazil
- Providence, United States
- Prudentópolis, Imaculada Conceição in -, Ukrainian Catholic Eparchy, Brazil
- Przemyśl, Poland
- Przemyśl-Warszawa (Ukrainian Catholic), Poland
- Pucallpa, Apostolic Vicariate, Peru
- Puebla de los Angeles, Mexico
- Pueblo, United States
- Puerto Cabello, Venezuela
- Puerto Escondido, Mexico
- Puerto Iguazú, Argentina
- Puerto Ayacucho, Apostolic Vicariate, Veneuzuela
- Puerto Carreño, Apostolic Vicariate, Colombia
- Puerto Gaitán, Apostolic Vicariate, Colombia
- Leguízamo–Solano, Apostolic Vicariate, Colombia
- Puerto Maldonado, Apostolic Vicariate, Peru
- Puerto Montt, Chile
- Puerto Plata, Dominican Republic
- Puerto Princesa, Apostolic Vicariate, Philippines
- Punalur, India
- Puno, Peru
- Punta Arenas, Chile
- Puntarenas, Costa Rica
- Punto Fijo, Venezuela
- Puqi, China
- Purnea, India
- Purwokerto, Indonesia
- Pusan (Busan), South Korea
- Puthur, Syro-Malankara Catholic Eparchy, India
- Puyo, Apostolic Vicariate, Ecuador
- Pyay, Myanmar
- Pyongyang (P'yŏng-yang), North Korea
- Qacha's Nek, Lesotho
- Qizhou, China
- Qingdao, China
- Quebec, Canada
- Queenstown, South Africa
- Quelimane, Mozambique
- Querétaro, Mexico
- Quetta, Apostolic Vicariate, Pakistan
- Quibdó, Colombia
- Quiché, Guatemala
- Quilmes, Argentina
- Quilon, India
- Quimper-Léon, France
- Quito, Ecuador
- Quixadá, Brazil
- Quy Nhơn, Vietnam
- Rabat, Morocco
- Rabaul, Papua New Guinea
- Radom, Poland
- Rafaela, Argentina
- Ragusa, Italy
- Raiganj, India
- Raigarh, India
- Raipur, India
- Rajkot, India
- Rajshahi, Bangladesh
- Raleigh, United States
- Ramanathapuram, India
- Rancagua, Chile
- Ranchi, India
- Rangoon (Yangon), Burma
- Raphoe, Ireland
- Rapid City, United States
- Rarotonga, Cook Islands
- Ratchaburi, Thailand
- Ratnapura, Sri Lanka
- Ravenna-Cervia, Italy
- Rawson, Argentina
- Rayagada, India
- Reconquista, Argentina
- Regensburg, Germany
- Reggio Calabria-Bova, Italy
- Reggio Emilia-Guastalla, Italy
- Regina, Canada
- Registro, Brazil
- Rehe, China
- Reims, France
- Rennes, France
- Reno, United States
- Resistencia, Argentina
- Requena, Apostolic Vicariate, Peru
- Reyes, Apostolic Vicariate, Bolivia
- Reykjavík, Iceland
- Rēzekne–Aglona, Latvia
- Rhodos, Greece
- Ribeirão Preto, Brazil
- Richmond, United States
- Rieti, Italy
- Riga, Latvia
- Rijeka, Croatia
- Rimini, Italy
- Rimouski, Canada
- Riobamba, Ecuador
- Rio Branco, Brazil
- Rio do Sul, Brazil
- Río Gallegos, Argentina
- Rio Grande, Brazil
- Riohacha, Colombia
- Robe, Apostolic prefecture, Ethiopia
- Rochester, United States
- Rockford, United States
- Rockhampton, Australia
- Rockville Centre, United States
- Rodez, France
- Rodrigues, Apostolic Vicariate, Mauritius
- Roermond, Netherlands
- Romblon, Philippines
- Rome, Italy
- Rondonópolis, Brazil
- Roraima, Brazil
- Rosario, Argentina
- Roseau, Dominica
- Rossano-Cariati, Italy
- Rottenburg-Stuttgart, Germany
- Rotterdam, Netherlands
- Rouen, France
- Rourkela, India
- Rouyn-Noranda, Canada
- Rožňava, Slovakia
- Rrëshen, Albania
- Rubiataba–Mozarlândia, Brazil
- Ruhengeri, Rwanda
- Rulenge, Tanzania
- Rumbek, Sudan
- Rundu, Apostolic Vicariate, Namibia
- Rustenburg, South Africa
- Rutana, Burundi
- Ruteng, Indonesia
- Ruy Barbosa, Brazil
- Ruyigi, Burundi
- Rzeszów, Poland
- Sabina-Poggio Mirteto, Italy
- Sacramento, United States
- Sagar, India
- Saginaw, United States
- Saida (Maronite), Lebanon
- Saida, Lebanon
- St Andrews and Edinburgh, United Kingdom
- St. Augustine, United States
- Saint Boniface, Canada
- Saint-Brieuc, France
- Saint Catharines, Canada
- Saint-Claude, France
- Saint Clement at Saratov, Russia
- Saint Cloud, United States
- Saint-Denis, France
- Saint-Denis-de-La Réunion, Réunion (French)
- Saint-Dié, France
- Sainte-Anne-de-la-Pocatière, Canada
- Sainte-Croix-de-Paris, Armenian Catholic Apostolic Eparchy, France, exempt
- Saint Ephrem of Khadki (Syro-Malankara), Exachate, India
- Saint-Étienne, France
- Saint-Flour, France
- Saint George in Canton, Romanian Catholic Eparchy, United States
- Saint George's in Grenada, Grenada
- Saint Helena, Ascension Island and Tristan da Cunha, Mission sui juris, Saint Helena, Ascension Island and Tristan da Cunha (UK)
- Saint-Hyacinthe, Canada
- Saint-Jean-Longueuil, Canada
- Saint-Jérôme, Canada
- Saint John Chrysostom of Gurgaon, Syro-Malankara Catholic Eparchy, India
- Saint John, New Brunswick, Canada
- Saint John's–Bassetere, the Caribbean
- St. John's, Newfoundland, Canada
- Saint Joseph at Irkutsk, Russia
- St. Louis, United States
- Saint-Louis du Sénégal, Senegal
- Saint-Maron de Montréal, Maronite Eparchy, Canada
- Saint Maron of Brooklyn, Maronite Eparchy, United States
- Saint Maron of Sydney, Maronite Eparchy, Australia
- Saint Michael's of Sydney, Melkite Greek*, Australia
- Saint Nicholas of Chicago, Ukrainian Catholic Eparchy, United States
- Saint Nicholas of Ruski Krstur, Greek Catholic Eparchy, Serbia
- Saint Paul, Alberta, Canada
- Saint Paul and Minneapolis, United States
- Saint Peter the Apostle of El Cajon, Chaldean Catholic Eparchy, United States
- Saint Petersburg, United States
- Saint-Sauveur de Montréal, Melkite Greek Catholic*, Canada
- Saints Cyril and Methodius of Toronto, Slovak Greek Catholic Eparchy, Canada
- Saints Peter and Paul of Melbourne, Ukrainian Catholic Eparchy, Australia
- Saint Thomas, at Charlotte Amalie, U.S. Virgin Islands
- Saint Thomas the Apostle of Chicago, Syro-Malabar Catholic Eparchy, United States
- Saint Thomas the Apostle of Detroit, Chaldean Catholic* Eparchy, United States
- Saint Thomas the Apostle of Sydney, Chaldean Catholic Eparchy, Australia
| - Saitama, Japan
- Sakania–Kipushi, Democratic Republic of the Congo
- Salamanca, Spain
- Sale, Australia
- Salem, India
- Salerno-Campagna-Acerno, Italy
- Salford, United Kingdom
- Salgueiro, Brazil
- Salina, United States
- Salmas, Chaldean Catholic Archeparchy (Archdiocese), Iran
- Salta, Argentina
- Saltillo, Mexico
- Salt Lake City, United States
- Salto, Uruguay
- Saluzzo, Italy
- Salzburg, Austria
- Samarinda, Indonesia
- Sambalpur, India
- Sambir-Drohobych, Ukrainian Catholic Eparchy, Ukraine
- Same, Tanzania
- Samoa-Apia, Samoa
- Samoa-Pago Pago, American Samoa
- San, Mali
- San Andrés y Providencia, Apostolic Vicariate, Colombia
- San Andrés Tuxtla, Mexico
- San Angelo, United States
- San Antonio, United States
- San Benedetto del Tronto-Ripatransone-Montalto, Italy
- San Bernardino, United States
- San Bernardo, Chile
- San Carlos, Philippines
- San Carlos de Ancud, Chile
- San Carlos de Bariloche, Argentina
- San Carlos de Venezuela, Venezuela
- San Charbel en Buenos Aires*, Eparchy, Argentina
- (San Cristóbal de) la Habana, Cuba
- San Cristóbal de La Laguna, Spain
- San Cristóbal de las Casas, Mexico
- San Cristóbal de Venezuela, Venezuela
- Sandakan, Malaysia
- Sandhurst, Australia
- Santo Domingo, Ecuador
- San Diego, United States
- Sandomierz, Poland
- Santo Domingo, Ecuador
- San Felipe, Chile
- San Felipe, Venezuela
- San Fernando, Philippines
- San Fernando de Apure, Venezuela
- San Fernando de La Union, Philippines
- San Francisco, Argentina
- San Francisco, United States
- San Francisco de Macorís, Dominican Republic
- San Francisco Javier (Jaén en Perú), Apostolic Vicariate, Peru
- San Francisco de Asís de Jutiapa, Guatemala
- Sanggau, Indonesia
- Sangmélima, Cameroon
- San Gregorio de Narek en Buenos Aires, Armenian Catholic*, Argentina
- San Ignacio de Velasco, Bolivia
- San Isidro, Argentina
- San Isidro de El General, Costa Rica
- San Jacinto, Ecuador
- San José de Amazonas, Apostolic Vicariate, Peru
- San Jose in Mindoro, Apostolic Vicariate, Philippines
- San Jose in Nueva Ecija, Philippines
- San Jose de Antique, Philippines
- San José de Costa Rica, Costa Rica
- San José del Guaviare, Colombia
- San José de Mayo, Uruguay
- San Jose in California, United States
- San Juan Bautista de Las Misiones, Paraguay
- San Juan de Cuyo, Argentina
- San Juan de La Maguana, Dominican Republic
- San Juan de los Lagos, Mexico
- San Juan de Puerto Rico, Puerto Rico
- San Justo, Argentina
- Sankt Gallen, Switzerland
- Sankt Pölten, Austria
- San Lorenzo, Paraguay
- San Luis, Argentina
- San Luis Potosí, Mexico
- San Marco Argentano–Scalea, Italy
- San Marcos, Guatemala
- San Marino–Montefeltro, San Marino & Italy
- San Martín, Argentina
- San Miguel, El Salvador
- San Miguel, Argentina
- San Miguel de Sucumbíos, Apostolic Vicariate, Ecuador
- San Miniato, Italy
- San Nicolás de los Arroyos, Argentina
- San Pablo, Philippines
- San Pedro, Paraguay
- San Pedro de Macorís, Dominican Republic
- San Pedro-en-Côte d'Ivoire, Côte d'Ivoire
- San Pedro Sula, Honduras
- San Rafael, Argentina
- San Ramón, Apostolic Vicariate, Peru
- San Roque de Presidencia Roque Sáenz Peña, Argentina
- San Salvador, El Salvador
- San Sebastián, Spain
- San Severo, Italy
- Santa Ana, El Salvador
- Santa Clara, Cuba
- Santa Cruz de la Sierra, Bolivia
- Santa Cruz do Sul, Brazil
- Santa Elena, Ecuador
- Santa Fe, United States
- Santa Fe de Antioquia, Colombia
- Santa Fe de la Vera Cruz, Argentina
- Santa Maria, Brazil
- Santa Maria di Grottaferrata, Italo-Albanese Territorial Abbacy, Italy
- Santa María de Los Ángeles, Chile
- Santa María del Patrocinio en Buenos Aires, Ukrainian Catholic Eparchy, in Buenos Aires, Argentina
- Santa Marta, Colombia
- Santander, Spain
- Sant'Angelo dei Lombardi–Conza–Nusco–Bisaccia, Italy
- Santarém, Portugal
- Santarém, Brazil
- Santa Rosa, Argentina
- Santa Rosa, United States
- Santa Rosa de Copán, Honduras
- Santa Rosa de Lima, Guatemala
- Santa Rosa de Osos, Colombia
- Sant Feliu de Llobregat, Spain
- Santiago Apóstol de Huancané, Territorial Prelature, Peru
- Santiago de Cabo Verde, Cape Verde
- Santiago de Chile, Chile
- Santiago de Compostela, Spain
- Santiago de Cuba, Cuba
- Santiago del Estero, Argentina
- Santiago de los Caballeros, Dominican Republic
- Santiago de María, El Salvador
- Santiago de Veraguas, Panama
- Santísimo Salvador de Bayamo y Manzanillo, Cuba
- Santíssima Conceição do Araguaia, Brazil
- Santo Amaro, Brazil
- Santo André, Brazil
- Santo Ângelo, Brazil
- Santo Cristo de Esquipulas, Territorial Prelature, Guatemala
- Santo Domingo, Dominican Republic
- Santo Domingo de los Colorados, Ecuador
- Santorini, Greece
- Santos, Brazil
- Santo Tomé, Argentina
- San Vicente, El Salvador
- San Vicente del Caguán, Colombia
- Sanyuan, China
- São Carlos, Brazil
- São Félix (do Araguaia), Territorial Prelature, Brazil
- São Gabriel da Cachoeira, Brazil
- São João Batista em(=in) Curitiba (Ukrainian), Ukrainian Catholic Archeparchy, Brazil
- São João Batista em Curitiba (Latin), Brazil
- São João da Boa Vista, Brazil
- São João del Rei, Brazil
- São José do Rio Preto, Brazil
- São José dos Campos, Brazil
- São José dos Pinhais, Brazil
- São Luís de Cáceres, Brazil
- São Luís de Montes Belos, Brazil
- São Luís do Maranhão, Brazil
- São Mateus, Brazil
- São Miguel Paulista, Brazil
- São Paulo, Brazil
- São Raimundo Nonato, Brazil
- São Salvador da Bahia, Brazil
- São Sebastião do Rio de Janeiro, Brazil
- São Tomé and Príncipe, São Tomé and Príncipe
- Sapë, Albania
- Sapporo, Japan
- Sarh, Chad
- Saskatoon, Canada
- Saskatoon, Ukrainian Catholic Eparchy, Canada
- Sassari, Italy
- Satna, India
- Satu Mare, Romania
- Sault Sainte Marie, Canada
- Saurímo, Angola
- Savannah, United States
- Savannakhet, Apostolic Vicariate, Cambodia
- Savona-Noli, Italy
- Scranton, United States
- Seattle, United States
- Sées, France
- Segheneyti, Eritrean Catholic Eparchy, Eritrea
- Segorbe–Castellón de la Plana, Spain
- Ségou, Mali
- Segovia, Spain
- Sekondi–Takoradi, Ghana
- Semarang, Indonesia
- Sendai, Japan
- Senigallia, Italy
- Sens, France
- Seoul, South Korea
- Serrinha, Brazil
- Sessa Aurunca, Italy
- Sete Lagoas, Brazil
- Setúbal, Portugal
- Sevilla, Spain
- Shamshabad, Syro-Malabar Catholic Eparchy, India
- Shanghai, China
- Shantou, China
- Shaoyang (Baoqing, Paoking), Apostolic prefecture, China PR
- Shaozhou, China
- Shendam, Nigeria
- Shenyang, China
- Sherbrooke, Canada
- 's-Hertogenbosch, Netherlands
- Shillong, India
- Shimoga, India
- Shinan, China
- Shinyanga, Tanzania
- Shkodër–Pult, Albania
- Shreveport, United States
- Shrewsbury, United Kingdom
- Shunde, China
- Shunqing, China
- Shuozhou, China
- Šiauliai, Lithuania
- Šibenik, Croatia
- Sibolga, Indonesia
- Sibu, Malaysia
- Sicuani, Peru
- Siedlce, Poland
- Siena–Colle di Val d'Elsa–Montalcino, Italy
- Sigüenza–Guadalajara, Spain
- Sikasso, Mali
- Simdega, India
- Simferopol (Crimea, Krym), Ukrainian Catholic Archiepiscopal Exarchate, Ukraine
- Simla and Chandigarh, India
- Sincelejo, Colombia
- Sindhudurg, India
- Singapore, Singapore
- Singida, Tanzania
- Sinop, Brazil
- Sintang, Indonesia
- Sion, Switzerland
- Sioux City, United States
- Sioux Falls, United States
- Sipingjie, China
- Siracusa, Italy
- Sisak, Croatia
- Siuna, Nicaragua
- Sivagangai, India
- Skopje, Macedonia
- Soacha, Colombia
- Sobral, Brazil
- Socorro y San Gil, Colombia
- Soddo, Apostolic Vicariate, Ethiopia
- Sofia-Plovdiv, Bulgaria
- Sohag, Coptic Catholic Eparchy, Egypt
- Soissons, France
- Sokal-Zhovkva, Ukrainian Catholic Eparchy, Ukraine
- Sokodé, Togo
- Sokoto, Nigeria
- Sololá–Chimaltenango, Guatemala
- Solsona, Spain
- Solwezi, Zambia
- Songea, Tanzania
- Sonsonate, El Salvador
- Sonsón–Rionegro, Colombia
- Sora-Aquino-Pontecorvo, Italy
- Sorocaba, Brazil
- Soroti, Uganda
- Sorrento-Castellammare di Stabia, Italy
- Sorsogon, Philippines
- Sosnowiec, Poland
- Southern Arabia, Apostolic Vicariate, in Abu Dhabi, UAE
- Southwark, United Kingdom
- Speyer, Germany
- Spiš, Slovakia
- Split–Makarska, Croatia
- Spokane, United States
- Spoleto-Norcia, Italy
- Springfield in Illinois, United States
- Springfield in Massachusetts, United States
- Springfield-Cape Girardeau, United States
- Srijem, Serbia
- Srikakulam, India
- Stamford, Ukrainian Catholic Eparchy, United States
- Steubenville, United States
- Stockholm, Sweden
- Stockton, United States
- Strasbourg, France
- Stryi, Ukrainian Catholic Eparchy, Ukraine
- Subotica, Serbia
- Suchitepéquez–Retalhuleu, Guatemala
- Sucre, Bolivia
- Suifu, China
- Suiyuan, China
- Sulaimaniya, Chaldean Catholic – see Kirkuk-Sulaimaniya, Iraq
- Sulmona-Valva, Italy
- Sultanpet, India
- Sumbawanga, Tanzania
- Sumbe, Angola
- Sunyani, Ghana
- Superior, United States
- Surabaya, Indonesia
- Surat Thani, Thailand
- Surigao, Philippines
- Susa, Italy
- Suva, Fiji
- Suwon, South Korea
- Suzhou, China
- Świdnica, Poland
- Sydney (Roman Catholic), Australia
- Sydney, Saint Thomas the Apostle of -, Chaldean Catholic Eparchy, Australia
- Sydney, Saint Maron of -, Maronite Eparchy, Australia
- Sydney, Saint Michael's of, Melkite Greek Eparchy, Australia
- Sylhet, Bangladesh
- Syracuse, United States
- Syros–Milos, Greece
- Szczecin–Kamień, Poland
- Szeged-Csanád, Hungary
- Székesfehérvár, Hungary
- Szombathely, Hungary
- Tabasco, Mexico
- Tabora, Tanzania
- Tabuk, Apostolic Vicariate, Philippines
- Tacámbaro, Mexico
- Tacna y Moquegua, Peru
- Tacuarembó, Uruguay
- Taegu (Daegu), South Korea
- Taejŏn: see Daejeon
- Tagbilaran, Philippines
- Tagum, Philippines
- Taichung, Taiwan
- Tainan, Taiwan
- Taiohae o Tefenuaenata, French Polynesia
- Taipei, Taiwan
- Taiyuan, China PR
- Taizhou, China PR
- Takamatsu, Japan
- Talca, Chile
- Talibon, Philippines
- Tamale, Ghana
- Tambacounda, Senegal
- Tampico, Mexico
- Tandag, Philippines
- Tanga, Tanzania
- Tanger, Morocco
- Tanjore, India
- Tanjungkarang, Indonesia
- Tanjung Selor, Indonesia
- Tapachula, Mexico
- Tarahumara, Mexico
- Taranto, Italy
- Tarawa and Nauru, Kiribati & Nauru
- Tarazona, Spain
- Tarbes-et-Lourdes, France
- Tarija, Bolivia
- Tarlac, Philippines
- Tarma, Peru
- Tarnów, Poland
- Tarragona, Spain
- Taubaté, Brazil
- Taunggyi, Myanmar
- Taungngu, Myanmar
- Taytay, Apostolic Vicariate, Philippines
- Teano-Calvi, Italy
- Techiman, Ghana
- Tefé, Territorial Prelature, Brazil
- Teggiano-Policastro, Italy
- Tegucigalpa, Honduras
- Teheran-Isfahan, Iran
- Tehran, Chaldean Catholic Metropolitan, Iran
- Tehuacán, Mexico
- Tehuantepec, Mexico
- Teixeira de Freitas-Caravelas, Brazil
- Tellicherry, India
- Telšiai, Lithuania
- Timişoara, Romania
- Tempio-Ampurias, Italy
- Temuco, Chile
- Tenancingo, Mexico
- Teotihuacan, Mexico
- Teófilo Otoni, Brazil
- Tepic, Mexico
- Teramo-Atri, Italy
- Teresina, Brazil
- Termoli-Larino, Italy
- Terni-Narni-Amelia, Italy
- Ternopil – Zboriv, Ukrainian Catholic Archeparchy, Ukraine
- Terrassa, Spain
- Teruel y Albarracín, Spain
- Tete, Mozambique
- Texcoco, Mexico
- Tezpur, India
- Thái Bình, Vietnam
- Thamarasserry, Syro-Malabar Eparchy, India
- Thanh Hóa, Vietnam
- Thare and Nonseng, Thailand
- Thessaloniki, Apostolic Vicariate, Greece
- Thiès, Senegal
- Thuckalay, India
- Thunder Bay, Canada
- Tianguá, Brazil
- Tianjin, China PR
- Tibú, Colombia
- Tierradentro, Apostolic Vicariate, Colombia
- Tijuana, Mexico
- Tilarán, Costa Rica
- Timika, Indonesia
- Timişoara, Romania
- Timmins, Canada
- Tingzhou, China PR
- Tiranë–Durrës, Albania
- Tiruchirapalli, India
- Tiruvalla, Syro-Malankara Catholic Archeparchy, India
- Tivoli, Italy
- Tlalnepantla, Mexico
- Tlapa, Mexico
- Tlaxcala, Mexico
- Toamasina, Madagascar
- Tocantinópolis, Brazil
- Tokyo, Japan
- Tôlagnaro, Madagascar
- Toledo, Spain
- Toledo, United States
- Toledo, Brazil
- Toliara, Madagascar
- Toluca, Mexico
- Tombura-Yambio, Sudan
- Tonga, Tonga & Niue
- Toowoomba, Australia
- Torino, Italy
- Torit, Sudan
- Toronto, Canada
- Toronto, Mar Addai of, Chaldean Catholic Eparchy, Canada
- Toronto, Saints Cyril and Methodius of, Slovak Catholic Eparchy, Canada
- Toronto and Eastern Canada, Ukrainian Catholic Eparchy, Canada
- Tororo, Uganda
- Torreón, Mexico
- Tortona, Italy
- Tortosa, Spain
- Toruń, Poland
- Toulouse, France
- Tournai, Belgium
- Tours, France
- Townsville, Australia
- Tranti-Barletta-Bisceglie, Italy
- Transfiguration at Novosibirsk, Russia
- Trapani, Italy
- Trento, Italy
- Trenton, United States
- Três Lagoas, Brazil
- Treviso, Italy
- Tricarico, Italy
- Trichur, Syro-Malabar Catholic Archeparchy, India
- Trier, Germany
- Trieste, Italy
- Trincomalee, Sri Lanka
- Trinidad, Apostolic Vicariate, Colombia
- Tripoli, Maronite Eparchy, Lebanon
- Tripoli (Lebanon), Melkite*, Lebanon
- Tripoli (Libya), Apostolic Vicariate, Libya
- Trivandrum, Syro-Malankara Catholic Metropolitan Archeparchy and Major Archdiocesis, India
- Trivento, Italy
- Trnava, Slovakia
- Trois-Rivières, Canada
- Tromsø, Territorial Prelature, Norway
- Trondheim, Territorial Prelature, Norway
- Troyes, France
- Trujillo, Peru
- Trujillo, Honduras
- Trujillo, Venezuela
- Tshumbe, Democratic Republic of the Congo
- Tsiroanomandidy, Madagascar
- Tuam, Ireland
- Tubarão, Brazil
- Tucson, United States
- Tucumán, Argentina
- Tucupita, Apostolic Vicariate, Venezuela
- Tuguegarao, Philippines
- Tui-Vigo, Spain
- Tula, Mexico
- Tulancingo, Mexico
- Tulcán, Ecuador
- Tulle, France
- Tulsa, United States
- Tumaco, Colombia
- Tunduru–Masasi, Tanzania
- Tunis, Tunisia
- Tunja, Colombia
- Tura, India
- Tursi-Lagonegro, Italy
- Tuticorin, India
- Tuxpan, Mexico
- Tuxtepec, Mexico
- Tuxtla Gutiérrez, Mexico
- Tyler, United States
- Tyre, Melkite Metropolitan Archeparchy, Lebanon
- Tyre, Maronite Archeparchy, Lebanon
- Tzaneen, South Africa
- Uberaba, Brazil
- Uberlândia, Brazil
- Ubon Ratchathani, Thailand
- Udaipur, India
- Udine, Italy
- Udon Thani, Thailand
- Udupi, India
- Ugento-Santa Maria de Leuca, Italy
- Uíje, Angola
- Uijeongbu (Uijongbu), South Korea
- Ujjain, India
- Ulaanbaatar (Ulan Bator), Apostolic prefecture, (Outer) Mongolia
- Umtata, South Africa
- Umuahia, Nigeria
- Umuarama, Brazil
- Umzimkulu, South Africa
- União da Vitória, Brazil
- Urbino–Urbania–Sant'Angelo in Vado, Italy
- Urdaneta, Philippines
- Urgell, Spain & Andorra
- Urmya, Iran
- Uromi, Nigeria
- Uruaçu, Brazil
- Uruguaiana, Brazil
- Utrecht, Netherlands
- Uvira, Democratic Republic of the Congo
- Uyo, Nigeria
- Vác, Hungary
- Vacaria, Brazil
- Vaduz, Liechtenstein
- Valdivia, Chile
- Valença, Brazil
- Valence, France
- Valencia, Spain
- Valencia, Venezuela
- Valladolid, Spain
- Valle de Chalco, Mexico
- Valle de la Pascua, Venezuela
- Valledupar, Colombia
- Valleyfield, Canada
- Vallo della Lucania, Italy
- Valparaíso, Chile
- Vancouver, Canada
- Vanimo, Papua New Guinea
- Vannes, France
- Varanasi, India
- Varaždin, Croatia
- Vasai, India
- Vélez, Colombia
- Velletri-Segni, Italy
- Vellore, India
- Venado Tuerto, Argentina
- Venezia, Italy
- Venice in Florida, United States
- Ventimiglia-San Remo, Italy
- Veracruz, Mexico
- Roman Catholic Diocese of Verapaz, Cobán, Guatemala
- Verapoly, India
- Vercelli, Italy
- Verdun, France
- Verona, Italy
- Versailles, France
- Veszprém, Hungary
- Viana, Brazil
- Viana, Angola
- Viana do Castelo, Portugal
- Vic, Spain
- Vicenza, Italy
- Victoria, Canada
- Victoria in Texas, United States
- Viedma, Argentina
- Vientiane, Apostolic Vicariate, Laos
- Vigevano, Italy
- Vijayapuram, India
- Vijayawada, India
- Vila Real, Portugal
- Vilkaviškis, Lithuania
- Villa de la Concepción del Río Cuarto, Argentina
- Villa María, Argentina
- Villarrica, Chile
- Villarrica del Espíritu Santo, Paraguay
- Villavicencio, Colombia
- Vilnius, Lithuania
- Vinh, Vietnam
- Vĩnh Long, Vietnam
- Virac, Philippines
- Visakhapatnam, India
- Viseu, Portugal
- Vitebsk, Belarus
- Viterbo, Italy
- Vitória, Brazil
- Vitória da Conquista, Brazil
- Vitoria, Spain
- Vittorio Veneto, Italy
- Viviers, France
- Volterra, Italy
- Vrhbosna, Bosnia and Herzegovina
- Wa, Ghana
- Wabag, Papua New Guinea
- Wagga Wagga, Australia
- Wallis et Futuna, Wallis and Futuna
- Wamba, Democratic Republic of the Congo
- Wanxian, China
- Warangal, India
- Warmia, Poland
- Warri, Nigeria
- Warszawa, Poland
- Warszawa-Praga, Poland
- Washington, United States
- Waterford and Lismore, Ireland
- Wau, Sudan
- Weetebula, Indonesia
- Weihui, China
- Wellington, New Zealand
- Western Sahara, Apostolic prefecture, Western Sahara
- Westminster, United Kingdom
- Wewak, Papua New Guinea
- Wheeling-Charleston, United States
- Whitehorse, Canada
- Wiawso, Ghana
- Wichita, United States
- Wien, Austria
- Wilcannia-Forbes, Australia
- Willemstad, Netherlands Antilles & Aruba
- Wilmington, United States
- Windhoek, Namibia
- Winnipeg, Canada
- Winnipeg, Canada
- Winona, United States
- Witbank, South Africa
- Włocławek, Poland
- Wollongong, Australia
- Wonju, South Korea
- Worcester, United States
- Wrexham, United Kingdom
- Wrocław, Poland
- Wrocław-Gdańsk, Poland
- Wuchang, China
- Wuhu, China
- Würzburg, Germany
- Wuzhou, China
- Xai-Xai, Mozambique
- Xalapa, Mexico
- Xiamen, China
- Xi'an, China
- Xiangyang, China
- Xianxian, China
- Xingu, Territorial Prelature, Brazil
- Xinyang, China
- Xiwanzi, China
- Xuân Lôc, Vietnam
- Xuanhua, China
- Xuzhou, China
- Yagoua, Cameroon
- Yakima, United States
- Yamoussoukro, Côte d'Ivoire
- Yan'an, China
- Yanggu, China
- Yangon (Rangoon), Burma
- Yanji, China
- Yantai, China
- Yanzhou, China
- Yaoundé, Cameroon
- Yarmouth, Canada
- Yauyos, Territorial Prelature, Peru
- Yei, Sudan
- Yendi, Ghana
- Yingkou, China
- Yizhou, China
- Yokadouma, Cameroon
- Yokohama, Japan
- Yola, Nigeria
- Yongjia, China
- Yopal, Colombia
- Yopougon, Côte d'Ivoire
- Yoro, Honduras
- Yucatán, Mexico
- Youngstown, United States
- Yuanling, China
- Yuci, China
- Yujiang, China
- Yurimaguas, Apostolic Vicariate, Peru
- Yuzhno Sakhalinsk, Apostolic prefecture, Russia
- Zacapa y Santo Cristo de Esquipulas, Guatemala
- Zacatecas, Mexico
- Zacatecoluca, El Salvador
- Zadar, Croatia
- Zagreb, Croatia
- Zahleh, Lebanon
- Zahleh and Furzol, Lebanon
- Zaku, Iraq
- Zamboanga, Philippines
- Zamora (in Ecuador), Apostolic Vicariate, Ecuador
- Zamora (in Mexico), Mexico
- Zamora (in Spain), Spain
- Zamość-Lubaczów, Poland
- Zanzibar, Tanzania
- Zaragoza, Spain
- Zárate-Campana, Argentina
- Zaria, Nigeria
- Zé Doca, Brazil
- Zhaotong (Chaotung), Apostolic Prefecture, China PR
- Zhaoxian, China
- Zhengding, China
- Zhengzhou, China
- Zhoucun, China
- Zhouzhi, China
- Zhumadian, China
- Zielona Góra-Gorzów, Poland
- Ziguinchor, Senegal
- Žilina, Slovakia
- Zipaquirá, Colombia
- Zomba, Malawi
- Zrenjanin, Serbia
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